WO2023067135A1 - Procédé et système de validation d'une correction orthopédique pour un individu - Google Patents
Procédé et système de validation d'une correction orthopédique pour un individu Download PDFInfo
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- WO2023067135A1 WO2023067135A1 PCT/EP2022/079368 EP2022079368W WO2023067135A1 WO 2023067135 A1 WO2023067135 A1 WO 2023067135A1 EP 2022079368 W EP2022079368 W EP 2022079368W WO 2023067135 A1 WO2023067135 A1 WO 2023067135A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
- A61B5/1121—Determining geometric values, e.g. centre of rotation or angular range of movement
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
- A61B5/112—Gait analysis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6829—Foot or ankle
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/20—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for computer-aided diagnosis, e.g. based on medical expert systems
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/30—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for calculating health indices; for individual health risk assessment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0219—Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
Definitions
- the invention relates to the field of podometry. In particular, it relates to a method for validating an orthopedic correction for an individual.
- the invention further relates to a device or system for validating an orthopedic correction of an individual.
- the foot comprising 26 bones, 107 ligaments and nearly 19 muscles, is a particularly complex part of the human body. It also plays an important role since it is the keystone allowing a human being to move. The slightest degradation of the latter can quickly be disabling. Although this is particularly true in the context of the practice of a sport involving contact of the foot with the ground, poor gait during daily activities can have a significant impact on health. The study of the forces applied to the foot during walking is therefore constantly evolving and new systems or new indicators making it possible to facilitate these studies are regularly emerging.
- Plantar orthoses are generally devices inserted into shoes to provide support to the foot by redistributing the reaction forces of the ground acting on the joints of the foot while standing, walking or running.
- These orthopedic corrections can be either pre-molded (also called pre-made) or custom made from a cast or impression of the foot. They are used by everyone from athletes to the elderly to accommodate biomechanical deformities and various soft tissue conditions. These orthopedic corrections are most often used for people with foot problems. However, these orthopedic corrections can have an effect on knee, hip and spine deformities.
- the design phase requires the expert eye of the practitioner and can be assisted by the implementation of video capture. Indeed, it has recently been shown that the kinetic contributions of the foot change throughout a walk and more particularly a run (Honert, et al., 2021; “Changes in ankle work, foot work, and tibialis anterior activation throughout a long run”; Journal of Sport and Health Science, https://doi.org/10.1016/j.jshs.2021.02.003). Thus, this reinforces the need for methods for validating orthopedic corrections capable of carrying out measurements during a movement of the foot, whether during a walk or a run. Indeed, the correction must be effective during a dynamic step and not when the foot is static.
- Video analyzes require the installation of very expensive installations in which the majority of practitioners cannot invest.
- the substitution of two-dimensional or three-dimensional video analysis by inertial sensors has been studied in certain fields (Hughes et al, 2019; “Are tibial angles measured with inertial sensors useful surrogates for frontal plane projection angles measured using 2-dimensional video analysis during single leg squat tasks? A reliability and agreement study in elite football (soccer) players”; Journal of Electromyography and Kinesiology Volume 44, February 2019, Pages 21-30).
- these methods were not able to show a possible substitution of video analyzes by analyzes via inertial units. Indeed, within the framework of the study of the projection angle of the frontal plane, it has been shown that inertial units do not make it possible to provide measurements of the absolute tibial angle and of the relative tibial angle consistent with two-dimensional video data.
- a semi-rigid plantar orthosis comprising 3-axis accelerometers, gyroscopes, magnetometers and strain gauges integrated in one or more flexible regions with a microprocessor and a wireless transmitter. It has been proposed that the data generated by these sensors can be used to track the gait cycle. Data on the flexion, or rotation of parts of the orthosis are processed and compared to the ideal or to data from other tests to assess the effectiveness of the orthosis.
- this method requires equipping each orthopedic correction manufactured with motion sensors and sophisticated communication systems. This increases the cost of the solution and reduces its democratization.
- the object of the invention is to remedy the drawbacks of the prior art.
- the aim of the invention is to propose a method making it possible to quickly validate, and preferably in real time, an orthopedic correction for an individual and this without the need to use expensive or fragile equipment.
- the invention also aims to propose a device and a system allowing the validation of an orthopedic correction for an individual.
- the invention relates in particular to a method for validating an orthopedic correction for an individual, said method comprising: - a step for acquiring movement data which has been generated, by at least one inertial unit positioned at the level of one foot of the individual, during a movement of the individual in the presence of the orthopedic correction to be validated ; - a calculation step, by one or more processors, from the movement data acquired, of a value of at least one foot angle for several instants of the movement of the individual; And a step of comparison, by the processor or processors, of the values of at least one calculated foot angle and of predetermined foot angle values, so as to validate or not the orthopedic correction.
- the applicant has developed a solution for validating an orthopedic correction capable of determining whether or not an orthopedic correction is suitable for an individual, based on movement data generated by at least one inertial unit.
- the present invention makes it possible to determine whether an orthopedic correction meets the needs of the individual.
- the latter may optionally include one or more of the following characteristics, alone or in combination: -
- the at least one inertial unit is positioned against the foot of the individual. As will be illustrated later, this can allow an improvement in accuracy and precision.
- - It includes a step for calculating an effective correction, preferably expressed in degrees. This allows the practitioner to quantify the correction in degrees relative to a movement of the individual without orthopedic correction.
- - It further comprises a step for acquiring movement data which have been generated, by at least one inertial unit positioned at the level of one foot of the individual, during a movement of the individual in the absence of orthopedic correction to be validated.
- This movement data generated in the absence of a correction can be used to calculate the predetermined foot angle values used during the comparison step.
- footwear becomes unnecessary and the correction can be placed against the foot of the individual just like the inertial unit.
- It further comprises a step of calculating a corridor of normality, said method then comprising the following steps executed by one or more processors: a step of acquiring movement data which have been generated, by at least one inertial unit positioned at the level of one foot of the individual, when the individual moves in the absence of orthopedic correction to be validated; and a step of calculating a normality corridor, from the acquired movement data.
- This corridor of normality can be used as predetermined foot angle values during the comparison step.
- the predetermined foot angle values are expected foot angle values which have been predetermined from data relating to the morphology of the individual and/or from characteristics of the article of footwear.
- the expected foot angle values may correspond to standard values for any individual without taking into account the morphological characteristics of the individual.
- the predetermined foot angle values are predetermined at least in part from the foot angle values observed in the absence of correction, possibly modified.
- the movement data acquisition step comprises the acquisition of movement data generated by two inertial units each positioned respectively at the level of a foot of the individual.
- the inertial unit is able to acquire acceleration and angular velocity data each on three axes. This makes it possible to simultaneously assess the orthopedic correction of each of the individual's two feet.
- It comprises a step of positioning at least one inertial unit at the foot of the individual.
- it comprises a step of positioning at least one inertial unit at the level of the foot of the individual to whom the orthopedic correction is applied.
- This positioning at the level of the foot can for example include the fixing, for example via an adhesive substance, of the inertial unit on the foot.
- the positioning can also be carried out on the article of footwear or in a sole of the article of footwear.
- - It comprises a step of generating movement data during which the at least one inertial unit is positioned against the foot of the individual, on the article of footwear or in a sole of the article of footwear.
- the process can be carried out directly at the practitioner's premises with initially the positioning of the inertial unit(s), the generation of data during a movement (eg walking or running) then in a shorter time interval at 10 minutes, the validation or not of the orthopedic correction.
- a movement eg walking or running
- the comparison step comprises a calculation of a value of deviation of the foot angle values calculated with respect to the predetermined foot angle values.
- the generation of a deviation value makes it possible to quantify to what extent the orthopedic correction does not conform to the needs of the individual.
- the generation of a deviation value makes it possible to quantify to what extent the orthopedic correction has caused a sufficient modification of the gait of the patient. 'individual. - the motion data includes acceleration and angular velocity values along three axes. These data make it possible to improve the precision of the validation of the orthopedic correction. These data may also include the derivatives and integrals of these physical quantities.
- the values of at least one foot angle calculated and compared comprise angle values selected from: an angle of the antero-posterior axis of the foot with respect to its line of progression, an angle of the antero-posterior axis posterior of the foot with respect to a plane formed by the ground, an angle of the transverse axis of the foot with respect to its line of progression or an angle of the transverse axis of the foot with respect to a plane formed by the ground.
- the use of these particular angles makes it possible to improve the accuracy of the validation of the orthopedic correction.
- the foot angle values of at least three instants of movement, preferably of at least five instants of movement, are calculated and then compared during the comparison step.
- foot angle values over several instants of the displacement makes it possible to improve the accuracy of the validation of the orthopedic correction.
- the displacement comprises at least one oscillation phase and the values of at least one foot angle calculated and compared comprise at least one foot angle value obtained from movement data generated during the oscillation phase. This makes it possible to improve the accuracy of orthopedic correction validation and to use data that is inaccessible with technologies based on force sensors. Indeed, the modifications made by the orthopedic correction on a foot at the time of the stance phase can influence the oscillating phase of this same foot or the oscillating phase of the other foot.
- the foot angle values are calculated for at least twenty walking cycles, preferably at least thirty and even more preferably at least fifty; and the values of at least one calculated foot angle, used during the comparison step, correspond to values obtained from at least twenty walking cycles, preferably at least thirty and even more preferably at least minus fifty.
- the values used for the comparison step correspond to an average or a median of the values obtained for the various walking cycles considered.
- the foot angle values are calculated for a plurality of gait cycles which have been previously selected on the basis of one or more calculated characteristics of the gait cycle; the said calculated characteristic(s) of the gait cycle comprising: a maximum acceleration value, a maximum propulsion speed value, a stride frequency, a stride length, a gait speed, a duration of the stance phase, and/or a duration of the oscillating phase.
- the invention relates to a system for validating an orthopedic correction for an individual, said system comprising: - at least one inertial unit, said inertial unit being arranged to be positioned at the level of a foot of the individual and being configured to generate movement data; - one or more processors configured for: - Acquiring movement data generated by the at least one inertial unit positioned at the foot of the individual, during a movement of the individual in the presence of the orthopedic correction to be validated; - Calculate from the movement data acquired, a value of at least one foot angle for several instants of movement; And - Compare values of at least one calculated foot angle and predetermined foot angle values, so as to validate or not the orthopedic correction.
- the system for validating an orthopedic correction may comprise two electronic boxes each comprising at least one of the inertial units and a computer device comprising the one or more processors, said electronic boxes comprising means of communication configured to transmitting, preferably in real time, the movement data to the computing device.
- FIG. 1 There shows a diagram of a method according to one embodiment of the invention.
- Optional steps are outlined in dotted lines.
- FIG. 1 There illustrates different positions of the inertial unit coupled to an article of footwear or to a foot fitted with an orthopedic correction.
- FIG. 1 There represents a diagram of an embodiment of the invention which may include a step for calculating a corridor of normality.
- the dotted steps are optional within the scope of carrying out this embodiment.
- each block in the flowcharts or block diagrams may represent a system, device, module, or code, which includes one or more executable instructions to implement the specified logical function(s).
- the functions associated with the blocks may appear in a different order than that shown in the figures. For example, two blocks shown in succession may, in fact, be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order, depending on the functionality involved.
- Each block in the block diagrams and/or flowchart, and combinations of blocks in the block diagrams and/or flowchart may be implemented by special hardware systems that perform the specified functions or acts or perform combinations of special equipment and computer instructions.
- motion data can correspond within the meaning of the invention to data comprising values of acceleration, angular velocity, magnetic fields or even fusion data obtained from one or more of these values.
- the movement data can be raw data or preprocessed data.
- the movement data includes acceleration and angular velocity values, preprocessed or not.
- an orthopedic correction corresponds, for example, in the meaning of the invention to an orthosis.
- Such an orthosis is preferably capable of correcting the behavior of a lower limb.
- an orthopedic correction may correspond to any device, whether articulated or not, intended: to correct defects in the kinetics of the lower limbs; to correct deformities of the lower limbs; and/or possibly allowing the rehabilitation of the lower limbs.
- an orthopedic correction can be intended to correct a defective static foot or an anomaly of the plantar relief, to compensate for the anomalies of the foot, to correct a static and dynamic imbalance of the individual or to prevent complications in the event of diabetes .
- An orthopedic correction is particularly suitable for an individual suffering from flat foot, pes cavus, disabling rheumatoid and neurotrophic condition of the foot, metatarsalgia, or even diabetes.
- validation of an orthopedic correction can correspond in the sense of the invention to an evaluation of the adequacy between an orthopedic correction and the needs of an individual.
- the validation may in particular correspond to a binary or non-binary, numeric, alphanumeric or alphabetic value indicating whether an orthopedic correction is suitable for the individual.
- the validation can correspond to a non-binary numerical value indicating to what extent the orthopedic correction is adapted to the individual.
- a practitioner can, with regard to the validation value, decide whether the orthopedic correction is appropriate or not.
- This validation can in particular be based on predetermined rules.
- the expression "positioned at the level of a foot” may correspond in the sense of the invention to the positioning of an inertial unit on the foot, in an item of footwear or on an item of footwear. This can also be interpreted as a coupling of the inertial unit with the foot since the movements of the inertial unit will then be a direct function of the movements of the foot of the individual.
- walking cycle within the meaning of the invention corresponds to the time interval between two presses of the heel of the same leg on the ground, or more generally two identical repeated events.
- the expression "stance phase” within the meaning of the invention may correspond, in the context of an analysis of the walking or running cycle, to the moment when the foot is at least partly in contact with the ground. It can include the attack of the step, the anterior step, the posterior step, and the propulsion which ends with the detachment of the foot.
- instant of the stance phase within the meaning of the invention corresponds to a time interval occurring during the pose of the foot, also called the stance phase of the foot.
- foot angle values within the meaning of the invention may correspond to angle values making it possible to represent the position of an individual's foot in its environment, that is to say by example with respect to a predetermined benchmark.
- This position may relate to the limbs of the individual with, for example, the angle formed by the axis of the tibia and the anteroposterior axis of the foot.
- This position can also be related to elements external to the individual with for example the angle formed by the anteroposterior axis of the foot and the ground.
- this position can also be relative to an angle formed by the anteroposterior axis of the foot and a calculated line of tread or a calculated trajectory of the foot.
- the angle values of the foot can also be used in the context of the invention in the form of a variable calculated from the angle values of the foot, such as a line of plantar pressure.
- predetermined reference within the meaning of the invention may correspond to an inertial reference such as a terrestrial reference or a non-inertial reference such as one or more limbs of the individual or even a reference generated from movement data of the individual.
- linear of plantar pressure within the meaning of the invention corresponds to the evolution of the position of the center of plantar pressures (e.g. barycentre) during the movement of an individual (e.g. . a walk or a run), preferably from the pose of the heel until the takeoff of the toes.
- sole is meant an object that separates the individual's foot from the ground.
- a shoe can comprise an upper sole layer in direct contact with the foot of the individual and a lower sole layer in direct contact with the ground or more generally the external environment.
- a shoe may also include a removable insole.
- removable is meant the ability to be easily detached, removed or disassembled without having to destroy the fastening means either because there are no fastening means or because the fastening means are easily and quickly removable (e.g. notch, screw, tab, lug, clips).
- fastening means are easily and quickly removable (e.g. notch, screw, tab, lug, clips).
- removable it should be understood that the object is not fixed by welding or by any other means not intended to allow the object to be detached.
- operations refer to actions and/or processes of a data processing system, for example a computer system or an electronic computing device, which manipulate and transform data represented as physical (electronic ) in computer system memories or other information storage, transmission or display devices. These operations can be based on applications or software.
- sample program code may include, but is not limited to, a subroutine, function, executable application, source code, object code, library, and/or any other sequence of instructions designed for the running on a computer system.
- processor is meant, within the meaning of the invention, at least one hardware circuit configured to execute operations according to instructions contained in a code.
- the hardware circuit may be an integrated circuit. Examples of a processor include, but are not limited to, central processing unit, graphics processor, application-specific integrated circuit (ASIC), and programmable logic circuit.
- ASIC application-specific integrated circuit
- Computer device means any device comprising a processing unit or a processor, for example in the form of a microcontroller cooperating with a data memory, possibly a program memory, said memories being able to be dissociated.
- the processing unit cooperates with said memories by means of an internal communication bus.
- Coupled in the sense of the invention, we mean connected, directly or indirectly with one or more intermediate elements. Two elements can be coupled mechanically, electrically or linked by a communication channel.
- the invention relates to a method 100 for validating an orthopedic correction 40 for an individual.
- an orthopedic correction validation method will comprise the following steps: a step of acquisition 140 of movement data which was generated during a movement of the individual in the presence of the orthopedic correction to be validated; a calculation step 150 of a value of at least one foot angle for several instants of the movement; and a step 160 of comparing the values of at least one calculated foot angle and predetermined foot angle values, so as to validate or not the orthopedic correction 40.
- a method according to the invention may also comprise the following steps: positioning 110 of at least one inertial unit at the foot of the individual; calculation of a value of at least one foot angle without correction for several instants of the movement, which may correspond to an initialization of the measurement 120; a step 130 of applying the orthopedic correction 40 to be validated to at least one foot of the individual; footwear 130a of the feet of the individual in at least one article of footwear 30 comprising the orthopedic correction 40 to be validated; calculation of an effective correction 170 in degrees.
- the method 100 for validating an orthopedic correction 40 for an individual is preferably implemented by one or more processors 12,22. As will be detailed below, the method is implemented from data comprising movement data, or calculated from movement data, generated by at least one inertial unit 11 coupled to the foot of said individual (eg . positioned at the level of the individual's foot).
- the processor(s) 12,22 implementing the method according to the invention may be integrated into an electronic box 10 also incorporating the inertial unit(s) or else be integrated into a computing device 20, such as a computer or a computer server. , configured to receive data generated by the inertial unit(s) 11.
- a system 1 for validating an orthopedic correction according to the invention will be detailed further in the remainder of this description.
- a method according to the invention may comprise a step 110 of positioning at least one inertial unit at the level of one foot of the individual.
- the inertial unit 11 could for example be a six-axis or nine-axis inertial unit.
- the at least one inertial unit can be integrated into an electronic box 10.
- the present invention will be detailed in the context of the use of an inertial unit positioned at the level of an individual's foot, but preferably, the present invention will be implemented with at least one inertial unit positioned at the level of each of an individual's feet so as to study both of the individual's feet.
- the positioning 110 of at least one inertial unit at the foot of the individual can be considered as a coupling of at least one inertial unit 11 to one foot of the individual.
- the positioning 110 of at least one inertial unit at the level of the foot may be a direct coupling or an indirect coupling.
- the at least one inertial unit 11 can be positioned against the foot of the individual, on the item of footwear or in a sole of the item of footwear.
- the at least one inertial unit 11b can be integrated into a sole of an article of footwear.
- the at least one inertial unit 11a, 11c can also be configured so as to be able to be fixed on an article of footwear.
- the positioning of the inertial unit on an article of footwear may depend on the arrangement of the inertial unit. It could for example be configured so as to be fixable on the back of an item of footwear or on the instep.
- inertial unit 11a at the level of the buttress
- in the sole in the sole
- inertial unit 11c exterior or interior
- inertial unit 11c for example at the level of the laces or the tongue.
- the at least one inertial unit can also be integrated directly into the orthopedic correction. This may be the case for example when the inertial unit 11b is integrated into a removable insole, the sole forming the orthopedic correction.
- the at least one inertial unit could be positioned in a reference sole used to study the gait of the individual before the implementation of the orthopedic correction then in a second time, the at least one inertial unit would be positioned directly in the orthopedic correction, for example in a removable manner.
- the positioning 110 of at least one inertial unit 11 at the level of a foot of the individual or the coupling between the at least one inertial unit and the foot of the individual can be such that the use of an article footwear is not necessary.
- the invention can be implemented from an inertial unit 11d directly coupled to the foot of the individual.
- This coupling can use an adhesive material making it possible to bond the inertial unit temporarily to the foot or else thanks to an accessory capable of holding the inertial unit against the foot of the individual.
- this positioning can be maintained by means of adhesive materials, elastic bands or by any other means making it possible to fix the inertial unit on the individual's foot in a punctual manner.
- the accessory could for example be elastic and take the form of an ankle brace or a strap.
- This embodiment can be particularly advantageous when the orthopedic correction 40 to be validated is not integrated into an article of footwear, but can be fixed at the level of the individual's foot. This is the case, for example, when the orthopedic correction 40 corresponds to an orthosis of the metatarsal pad type, toe correctors or foot splints.
- the positioning and maintenance of the orthopedic correction is generally ensured using adhesive materials, elastic bands or by any other means 41 making it possible to maintain the orthopedic correction against the foot of the individual.
- the positioning step 110 may include the positioning of at least one inertial unit 11 on the foot of the individual for whom the orthopedic correction 40 must be validated.
- the at least one inertial unit 11 can be positioned on the individual's foot before the orthopedic correction 40 is applied. This can for example make it possible to determine foot angle values in the absence of orthopedic correction.
- Table 1 illustrates the advantage of certain positions and in particular of the presence of a positioning step 110 of the inertial unit 11 against the foot of the individual compared to other positions of the inertial unit 11 .
- Table 1 Positioning of the inertial unit Sensitivity Specificity against the foot of the individual 0.95 0.91 On the tongue of the shoe 0.88 0.78 In the sole 0.92 0.89 In orthopedic correction 0.89 0.90
- Table 1 illustrates the sensitivity and specificity of a validation method according to the invention as a function of the positioning of the inertial unit. Sensitivity and specificity data can be obtained by comparison with validation data obtained by conventional means of the state of the art (i.e. validation opinion from a practitioner).
- the positioning step 110 may include the positioning of at least one inertial unit on an article of footwear of the individual for which the orthopedic correction 40 must be validated.
- the at least one inertial unit 11 can be positioned on the article of footwear 30 before the orthopedic correction 40 is applied. This can for example make it possible to determine foot angle values in the absence of correction orthopedic.
- a method according to the invention will be able to use movement data coming from several inertial units 11 positioned at the level of the feet of the individual.
- the method according to the invention could be based on movement data coming from two inertial units 11 each positioned respectively at the level of one of the feet of the individual (preferably against the foot of the individual).
- the method according to the invention may comprise a step of generating movement data by at least one inertial unit 11, the inertial unit 11 being able to be positioned in an electronic box 10 fixed to an article of footwear 30 worn by the individual whose orthopedic correction must be validated.
- the data generated by the inertial unit 11 can preferably be generated during a walk of the individual, a run or any other exercise likely to generate data that can be used in the context of an analysis of foot displacement kinetics in the foot. 'space. This data is called motion data.
- the inertial unit 11 is preferably coupled to an article of footwear, but more generally it is coupled to the foot of an individual (ie. positioned at the level of the foot of the individual). The coupling can therefore be direct or via an article of footwear.
- the motion data preferably includes acceleration values and angular velocity values as a function of time.
- they may include values of magnetic fields as a function of time.
- motion data can include time series.
- the movement data are preferably generated for a plurality of instants of the foot pose.
- the movement data are generated for at least ten instants of the pose of the foot, preferably at least twenty and more preferably at least fifty.
- the movement data will comprise movement data generated from the moment of placing the heel to the moment of placing the toes (limits included).
- the motion data may also include motion data generated from the time the heel takes off to the time the toes take off (limits included). Indeed, the applicant has determined that these data were of particular importance for improving the performance of the method according to the invention.
- the method 100 for validating an orthopedic correction may include a step of preprocessing the movement data generated by the inertial unit(s) 11.
- this motion data preprocessing step may correspond to the preprocessing of acceleration, angular velocity, and/or magnetic field values.
- it may include in particular at least one processing selected from: frequency filtering, gravity suppression on the acceleration values, gravity suppression, noise suppression on the acceleration values and suppression drift on the measured angular velocity values.
- the movement data can correspond to data generated by an inertial unit 11 which have been normalized, filtered, supplemented or else to data which have been merged for example by Kalman filtering.
- the motion data includes variable values in the form of time series. These variable values may preferably correspond to acceleration and angular velocity values. They may possibly comprise magnetic field data or a fusion of these data.
- a method according to the invention may include a step 120 of calculating a value of at least one foot angle for several instants of movement without correction. This step can be considered as a measurement initialization step.
- This calculation step 120 of a value of at least one foot angle for several instants of movement without correction makes it possible, during a method for validating an orthopedic correction, to establish an initialization or a tare specific to the individual concerned.
- the following steps of the method could be based in part on these foot angle values obtained for several instants of the movement without correction. They could in particular be used during the validation step in comparison with these foot angle values obtained for several instants of displacement with correction.
- foot angle values obtained for several instants of movement without correction can be used directly or modified according to data from the literature such as reference values or even according to data relating to the morphology of the individual.
- a method according to the invention may include a step of calculating a corridor 123 of normality.
- Each individual has a different gait influenced by their morphology and their history (eg injury, illness, etc.).
- a practitioner must determine the form that an orthopedic correction should take, he takes into account the specific parameters of the individual to make a tailor-made orthopedic correction or to combine the appropriate inserts to provide a suitable correction.
- the corridor of normality of an individual may correspond to a set of angle values that the foot of an individual may present, in a plurality of instants, during a gait cycle without his gait being considered. as abnormal.
- Such a corridor of normality 65a, 65b is illustrated in the .
- the individual may have different lines of plantar pressure 60a, 60b for each of these feet and different corridors of normality 65a, 65b for each of these feet.
- the normality corridor may comprise a range of values (eg min max) for several angles of the foot (or feet) of the individual.
- the root angle values used in the method can be substituted by values calculated from these root angle values. This is for example the case of a plantar pressure line calculated from the foot angle values.
- the calculation of the corridor of normality will be based on the foot angle values calculated for several instants of the movement without correction.
- the method according to the invention will be able to calculate a corridor of normality by applying one or more mathematical transformations.
- the calculation of the normality corridor may comprise the establishment of a range of foot angle values for a plurality of instants making it possible to bring the foot angle values of the individual closer to the angle values feet considered normal.
- line 61a represents a line of plantar pressure considered normal.
- the normality corridor 65a was calculated from the foot angle values obtained from movement data generated during movement without correction, but also from movement data (here a line of plantar pressure) considered to reflect a normality.
- the calculation 120 of a value of at least one foot angle without correction for several instants of movement may include an optional step 121 of fitting the individual's feet in an article of footwear not including the orthopedic correction to be validated.
- the calculation of a value of at least one foot angle without correction for several instants of the displacement could be carried out when the individual is not wearing an article of footwear.
- the calculation 120 of a value of at least one foot angle without correction includes a step 122 of acquisition of movement data generated when the individual moves in the absence of orthopedic correction to be validated. This acquisition is for example carried out by one or more processors 12,22.
- movement data are preferences generated by at least one inertial unit coupled to a foot of the individual.
- this movement data could be generated by force sensors or by a system comprising video capture.
- the step of calculating a normality corridor uses the at least one inertial unit 11 coupled to a foot of the individual used for the rest of the method according to the invention.
- the acquisition may comprise a transmission of the movement data generated (for example by the at least one inertial unit) to a processor or to a memory coupled to a processor.
- the method according to the invention may include a step 123 of calculating a normality corridor.
- This corridor of normality may be similar for all individuals and be based on bibliographic data relating to individuals' gait and what could be considered normal gait.
- the corridor of normality can be a function of the individual concerned, taking into account, for example, his morphology.
- the corridor of normality can in particular depend on the approach of the individual in the absence of correction.
- the normality corridor can be based at least in part on foot angle values calculated from motion data generated in the absence of correction. The calculation is for example carried out by one or more processors 12,22. As will be detailed later, these processors 12,22 can be integrated into an electronic box 10 or a computer device 20.
- the normality corridor can in particular be calculated from a comparison between the movement data generated and reference data.
- the step will include the calculation of a minimum value and a maximum value of a foot angle, this for several instants of a gait cycle and in particular of a stance phase.
- a method according to the invention may comprise: - a step 110 of positioning an inertial unit at the level of a foot of the individual, preferably against the foot of the individual, more preferably at the level of the metatarsals; - a step 122 of acquisition of movement data generated, by at least one inertial unit 11 positioned at the level of a foot of the individual, during a movement of the individual in the absence of the orthopedic correction to be validated; - a step 130a of fitting the feet of the individual in at least one item of footwear 30 comprising the orthopedic correction 40 to be validated or positioning the orthopedic correction 40 on at least one foot of the individual; - a step 140 of acquisition of movement data which have been generated, by at least one inertial unit 11 positioned at the level of a foot of the individual, during a movement of the individual in the presence of the orthopedic correction to validate ; - a calculation step 150, by one or more processors 22, from the movement data acquired, of a value of at least one
- the predetermined foot angle values may have been calculated from the movement data generated during the movement of the individual in the absence of the orthopedic correction to be validated.
- a method according to the invention may comprise a step 130 of applying the orthopedic correction to be validated to at least one foot of the individual. This can in particular involve a step 130a of putting on the individual's feet in at least one article of footwear 30 comprising the orthopedic correction to be validated or positioning the orthopedic correction 40 on at least one foot of the individual.
- orthopedic correction takes the form of a corrective insole, one or more inserts, or a heel pad.
- the validation process will include an application of the orthopedic correction, for example via the insertion of the orthopedic correction in an article of footwear to be worn by the individual or via a positioning directly on a foot of the individual of the orthopedic correction.
- the validation is based on movement data generated by one or more inertial units positioned at the level of the individual's foot.
- the method may include before or after the fitting or the application of the orthopedic correction the positioning 110 of at least one inertial unit at the level of the foot of the individual.
- the validation method then comprises a step 140 of acquiring movement data generated during a movement of the individual in the presence of the orthopedic correction 40 to be validated.
- the acquisition may comprise a transmission of the movement data generated (for example by the at least one inertial unit) to a processor or to a memory coupled to a processor.
- the processor or processors 12,22 can for example be integrated into an electronic box 10 comprising at least one inertial unit or into a computing device 20 configured to receive movement data.
- the acquisition step 140 of movement data comprises the acquisition of movement data generated by at least two inertial units each positioned respectively at the level of a foot of the individual (or even each coupled respectively to one foot of the individual).
- the validation method comprises a step 150 of calculating a value of at least one foot angle for several instants of the movement of the individual in the presence of the orthopedic correction to be validated.
- This calculation step 150 is preferably carried out from the movement data generated by the at least one inertial unit 11.
- This calculation step is preferably carried out by one or more processors 12,22 which can for example be integrated into a box electronic 10 comprising at least one inertial unit or to a computer device 20 configured to receive the movement data.
- the calculation 150 of a value of at least one foot angle is made with respect to a predetermined reference.
- the step 150 of calculating a value of at least one foot angle preferably corresponds to a step of calculating angle values for the two feet of the individual.
- walking or running can influence the absorption achieved by the soft tissues of the foot.
- muscle fatigue and in particular anterior tibial fatigue can influence the amount of work absorbed by the soft tissues of the foot or the padding of the shoe.
- the kinetic behavior of the feet changes throughout a movement such as a long run.
- the calculation step 150 is advantageously carried out using movement data generated by the at least one inertial unit 11 during a walk or a run.
- the movement data acquired includes several instants corresponding to a walking cycle.
- the acquired movement data includes several instants corresponding to the attack of the step, the anterior step, the posterior step, and/or the propulsion.
- the foot angle values are calculated over at least two instants of the pose of the individual's foot, or stance phase.
- the step 150 of calculating a value of at least one foot angle includes the calculation of angle values for at least two instants of the pose of the foot, preferably at least five and more favorite at least ten.
- foot angle values There are many methods for calculating foot angle values according to the reference frames used. Indeed, the foot angle values generally correspond to the angle values of a foot with respect to its environment. Examples of foot angle values that can be calculated are shown in Figures 2 and 5.
- angles 52.54 could for example be calculated as a function of the walking line 50 of the individual. They may also be calculated relative to the ground or even relative to the anteroposterior axis 51,53 of the individual's foot.
- the walking line 50 can itself be calculated conventionally by the methods known to those skilled in the art and then used as a reference for calculating the angle values of the foot within the scope of the present invention.
- the calculated foot angle values comprise angle values selected from: an angle of the antero-posterior axis of the foot with respect to its line of progression, an angle of the antero-posterior axis of the foot with respect to a plane formed by the ground, an angle of the transverse axis of the foot with respect to its line of progression or an angle of the transverse axis of the foot with respect to a plane formed by the ground.
- the present invention derives a particular advantage from the use of values of several angles of the foot.
- the step 150 of calculating a value of at least one foot angle comprises the calculation of values of at least two foot angles, preferably of at least three foot angles and of more preferably at least four angles of the foot.
- angles that can be used in the context of the invention, we can for example cite the strike angle corresponding to a measurement of the angle between the base of the foot and the ground at initial contact. This angle can continue to be measured during the attack phase of the step until the forward step phase. As shown in , the angle 46 between the base of the foot 45 and the ground can also be measured during the propulsion phase.
- the movement data generated during a movement of the individual in the absence of orthopedic correction to be validated or in the presence of orthopedic correction to be validated can be used to calculate descriptors of a gait such as speed, acceleration, spatial displacement, or even angular and linear speed.
- the values of these descriptors of a gait may be used in particular within the framework of a gait cycle selection to be used for a validation phase or directly during the validation stage of the orthopedic correction.
- the validation method includes a step 160 of comparing the values of at least one calculated foot angle and predetermined foot angle values.
- This calculation step is preferably carried out by one or more processors 12,22 which can for example be integrated into the electronic box 10 or into the computer device 20.
- this comparison 160 makes it possible to validate or not the orthopedic correction 40.
- the predetermined foot angle values can for example be selected from: - reference foot angle values, for example from the literature; - foot angle values calculated during movement of the individual without correction; - foot angle values calculated during movement of the individual without correction, but corrected for example by values related to the morphology of the individual.
- the predetermined foot angle values can be recorded in an electronic box 10 comprising at least one inertial unit or a computer device 20 configured to receive movement data from an inertial unit.
- These values can represent predetermined expected values of at least one foot angle over one or more instants of the pose of the foot.
- these values could, for example, take the form of numerical charts making it possible, from values of at least one calculated foot angle, to determine whether the orthopedic correction is effective and therefore whether it can be validated.
- These values can alternatively represent the predetermined values of at least one foot angle over one or more instants of the pose of the foot during a movement without correction of the individual.
- these values will be reference values making it possible to determine whether the orthopedic correction is significantly effective compared to a displacement without correction and therefore whether it can be validated.
- predetermined foot angle values may for example be a function of physiological characteristics of the individual.
- the predetermined foot angle values have been predetermined from data relating to the morphology of the individual and/or characteristics of the article of footwear.
- these predetermined foot angle values may be taken from the normality corridor 65a, 65b calculated according to an embodiment of the present invention. Indeed, they are then perfectly adapted to the individual and allow a better validation of the orthopedic correction.
- the comparison 160 is preferably made from the angle values calculated over the at least two times when the individual's foot is posed.
- the comparison 160 can be made from the angle values calculated on the at least two instants of the pose of the foot of the individual selected among: the instant of pose of the heel, the instant of pose of the toes , the heel lift-off time and the toe lift-off time.
- the comparison step 160 comprises the use of angle values calculated for at least two instants of the pose of the foot, preferably at least five and more preferably at least ten. Indeed, it is important that the orthopedic correction is able to correct the roll of the foot in a movement and not only the distribution of pressure forces during a stationary phase of the foot.
- the calculated angle values used during the comparison 160 comprise a majority of angle values calculated from movement data generated from the moment of placing the heel to the moment of placing the toes (limits included) and from the instant of heel lift-off to the instant of toe lift-off (limits included).
- the calculated angle values used during the comparison 160 comprise at least 60% of angle values calculated from movement data generated from the instant of heel strike until the instant of pose of the toes (limits included) and from the instant of heel lift-off until the instant of take-off of the toes (limits included).
- the calculated angle values used during the comparison 160 comprise at least 70% of angle values calculated from motion data generated from the moment of heeling down to the moment of poses of the toes (limits included) and from the moment of takeoff of the heel until the moment of takeoff of the toes.
- the calculated angle values used during the comparison 160 comprise at least 80% of angle values calculated from movement data generated from the instant of heel strike until the instant from the toe landing (limits included) and from the moment of heel lift-off until the moment of toe lift-off (limits included).
- This comparison step 160 is preferably performed from values of several angles. Preferably, the comparison step 160 is performed from the values of at least two angles of the foot, preferably of at least three angles of the foot and more preferably at least four angles of the foot.
- the comparison step 160 can be repeated so as to establish a confirmed validation from several walking or running cycles, in particular several support phases. This increases the reliability of the validation. Indeed, unlike techniques based on observation or motion capture, the present method can exploit a very large number of walking cycles without it becoming tedious for an observer or extremely consuming in computing power during using video capture.
- the foot angle values used during the comparison step 160 are preferably calculated from a plurality of gait cycles (eg median, average, etc.).
- the foot angle values used during the comparison step 160 have been calculated from at least twenty walking cycles, preferably at least thirty and even more preferably at least fifty. This makes it possible to create consolidated data across several cycles and therefore to precisely measure the impact of the correction by differentiating it from intra-individual variations.
- a consolidated displacement line eg, plantar pressure line
- reference data eg, plantar pressure line
- the foot angle values used during the comparison step 160 have been calculated for a plurality of gait cycles which have been previously selected on the basis of one or more calculated characteristics of the gait cycle. market. Indeed, the acquisition of a hundred gait cycles is quite fast and the precision and accuracy of the method according to the invention can be improved by a prior selection of the gait cycles used to calculate the values of foot angles. which will be used during the comparison step 160.
- the selection of gait cycles can for example take into account calculated characteristics such as: a maximum acceleration value, a maximum propulsive force value, a step frequency, a step length, a walking speed, a duration of the support phase, and/or a duration of the oscillating phase. If the value of one or more characteristics of the walking cycle exceeds a predetermined threshold then the walking cycle can be discarded and not considered for the remainder of the process.
- the present invention has the advantage of being able to base the validation of the correction on biomechanical parameters. Indeed, during the comparison step 160, the method according to the present invention may include taking into account values of biomechanical parameters of the individual.
- biomechanical parameters will for example have been calculated from the movement data generated by the inertial units.
- the taking into account of these values of biomechanical parameters of the individual may comprise a comparison between values of biomechanical parameters of the individual calculated from movement data generated during movement with correction and values of biomechanical parameters of the individual calculated from movement data generated during movement without correction.
- the biomechanical parameters of the individual can for example be selected from: the force of propulsion, the length of a step, a maximum acceleration value, an acceleration value at a given instant of the gait cycle, a value maximum propulsion force, a propulsion speed value at a given instant of the gait cycle, a step frequency, a step length, a gait speed, a duration of the stance phase, or even a duration of the oscillating phase.
- one of the advantages of the present invention is to be able to objectively validate an orthopedic correction without having to use a pressure sensor or analysis by two or three-dimensional camera whereas this constituted before the present invention a passage obligated to podometry for an objective validation of an orthopedic correction.
- the method according to the invention does not take into account data coming from a pressure sensor coupled to an article of footwear of the individual.
- the comparison step 160 could be carried out from values of at least one foot angle calculated from movement data generated during a walk of the individual and/or from data of movement generated during a race of the individual.
- the calculated and compared foot angle values comprise angle values selected from: an angle of the antero-posterior axis of the foot with respect to its line of progression, an angle of the antero-posterior axis posterior of the foot with respect to a plane formed by the ground, an angle of the transverse axis of the foot with respect to its line of progression or an angle of the transverse axis of the foot with respect to a plane formed by the ground.
- the movement includes at least one stance phase
- the values of at least one foot angle calculated and compared include at least one foot angle value obtained during at least one stance phase.
- the movement includes at least one oscillation phase and the calculated and compared foot angle values include at least one foot angle value obtained from movement data generated during an oscillation phase.
- On-board pressure sensors or mats equipped with pressure sensors cannot access the position of the foot during the swing phase. However, this position has an impact on the general gait of an individual and can be influenced by orthopedic corrections.
- the present invention advantageously makes it possible to take into consideration the oscillating phase so as to validate an orthopedic correction both on the basis of a behavior of the foot during the stance phase and during the oscillating phase.
- the comparison step 160 may include a calculation of one or more deviation values of the calculated foot angle values from the predetermined foot angle values.
- a validation can be issued if the calculated deviation value is less than a reference deviation value.
- there may be a comparison of the calculated toe angle values to the toe angle values associated with the normality corridor.
- there will be calculation of a deviation value over one or more instants of the pose of the foot allowing, in comparison with one or more deviation values, to determine whether or not the orthopedic correction can be validated.
- the present invention comprises a step of calculating an effective correction 170.
- This step of calculating is preferably carried out by one or more processors 12,22 which can for example be integrated into an electronic box 10 further comprising at least one inertial unit or to a computer device 20 configured to receive movement data generated by at least one inertial unit.
- the foot and the articles of footwear contain soft tissues which, depending on the type of movement (e.g. walking/running) or the orthopedic inserts used, will deform, thus influencing the orthopedic correction.
- the orthopedic correction comprising soft or elastic zones, there is a modification of the angle of correction according to the interaction between the foot of the individual and the orthopedic correction.
- the present invention can advantageously include a step of calculating an effective correction 180 making it possible to quantify the correction obtained by the orthopedic correction.
- the step of calculating an orthopedic correction may be based on a comparison of values of foot angles calculated in the absence of orthopedic correction and values of foot angles calculated in the presence of orthopedic correction.
- the validation of the orthopedic correction is carried out in real time, that is to say less than 1 hour after the generation of the data by one or more of the inertial units, preferably less than 10 minutes, in a more preferably less than one minute, even more preferably less than 10 seconds.
- the method can also include a data storage step.
- This storage is preferably done continuously. In particular, this may correspond to the storage of all the data generated and/or calculated within the framework of a method according to the invention.
- the stored data can for example be raw data as generated by the motion sensors, pre-processed data, transformed data or orthopedic correction validation data.
- a method in accordance with the invention may comprise a step of transmitting data to a remote computing device.
- the invention relates to a system 1 for validating an orthopedic correction for an individual.
- a system 1 for validating an orthopedic correction will comprise at least one inertial unit 11 and one or more processors 12, 22.
- a system 1 for validating an orthopedic correction may include a data memory 13.23 and a means of communication 14.24.
- the validation system 1 according to the invention can be arranged in the form of an electronic box 10 comprising at least one inertial unit 11 and one or more processors 12 configured to validate an orthopedic correction, for example by implementing a method according to the invention.
- the validation system 1 according to the invention is arranged in the form of an electronic box 10 comprising the at least one inertial unit 11 and a computer device 20 comprising a means of communication 24 configured to receive the movement data generated by the at least one inertial unit and one or more processors 22 configured to validate an orthopedic correction, for example by implementing a method of the invention.
- a validation system 1 comprises at least one inertial unit 11.
- This at least one inertial unit 11 is configured to generate movement data during movement of the individual in the presence or not of an orthopedic correction to be validated.
- it is preferably arranged to be coupled to a foot of the individual, that is to say arranged to be positioned at the level of a foot of the individual.
- the inertial unit 11 is for example made up of at least one accelerometer and a gyroscope. Preferably, it comprises several accelerometers and gyroscopes. More preferably, the inertial unit 11 comprises at least one accelerometer and at least one gyroscope.
- the inertial unit 11 is able to acquire movement data representative of a movement (acceleration and/or speed, for example angular speed) of the foot along the axes X, Y, Z during the movement of the individual.
- the electronic box 10 can also comprise one or more magnetometers so as to acquire three additional raw signals corresponding to the values of magnetic fields in three dimensions.
- the validation system 1 may comprise one or more electronic boxes 10 comprising at least one inertial unit 11, said electronic box being arranged to be positioned at the level of a foot of the individual.
- the electronic box(es) may be arranged so as to be positioned against a foot of the individual or on an item of footwear worn by the individual.
- the electronic box 10 could be integrated into a sole.
- the soles that can be used in the context of the validation system 1 according to the invention can, for example, correspond to outer soles or to inner soles of shoes. These soles can be removable or be permanently integrated into the sole of the shoes.
- An electronic box 10 advantageously weighs only a few grams (eg less than 10 grams) and has a small size suitable for positioning on a foot or a shoe of the individual (eg volume less than or equal to 10 cm3, preferably less than or equal to 8 cm3). This low volume limits the impact on user comfort.
- Each electronic box 10 can also include other sensors, in particular an inclinometer, a barometer, a temperature sensor, a humidity sensor and an altimeter to benefit from increased precision.
- sensors in particular an inclinometer, a barometer, a temperature sensor, a humidity sensor and an altimeter to benefit from increased precision.
- a validation system 1 also comprises one or more processors 12,22.
- processors are advantageously configured to execute instructions making it possible to implement all or part of the embodiments of the validation method according to the invention.
- this or these processors 12.22 are configured for: - Acquire movement data generated by the at least one inertial unit 11 positioned at the level of a foot of the individual; - Calculate from the movement data acquired, a value of at least one foot angle for several instants of movement; And - Compare values of at least one calculated foot angle and predetermined foot angle values, so as to validate or not the orthopedic correction.
- the one or more processors 12 can be positioned at the level of the electronic box 10.
- the validation system 1 can comprise a computer device 20 comprising one or more processors 22 configured to process the movement data coming from the electronic boxes 10.
- the validation system 1 comprises a computer device 20 comprising one or more processors 22 configured to implement one or more embodiments, whether or not they are preferred of the method according to the invention.
- a dedicated application is installed on this computer device 20 in order to process the information transmitted by the electronic device(s) 10 and allow the user to interact with the invention.
- the computing device 20 is generally a tablet, a mobile telephone ("smartphone" in English terminology), a computer or a server.
- the electronic box 10 and / or the computer device 20 may include a data memory 13.23 configured to store at least part of the data generated by the inertial unit 11 and / or the processor 12.22.
- the electronic box 10 and/or the computer device 20 may comprise a means of communication 14,24 configured to transmit movement data and/or data relating to the validation of the orthopedic correction.
- the means of communication are capable of receiving and transmitting the data on at least one communication network R1, for example intended for a server 70.
- the communication is carried out via a wireless protocol such as wifi , 3G, 4G, and/or Bluetooth.
- the invention may be the subject of numerous variants and applications other than those described above.
- the various structural and functional characteristics of each of the implementations described above should not be considered as combined and/or closely and/or inextricably linked to each other, but on the contrary as simple juxtapositions.
- the structural and/or functional characteristics of the various embodiments described above may be the subject, in whole or in part, of any different juxtaposition or any different combination.
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Abstract
Description
- une étape d’acquisition de données de mouvement qui ont été générées, par au moins une centrale inertielle positionnée au niveau d’un pied de l’individu, lors d’un déplacement de l’individu en présence de la correction orthopédique à valider ;
- une étape de calcul, par un ou plusieurs processeurs, à partir des données de mouvement acquises, d’une valeur d’au moins un angle de pied pour plusieurs instants du déplacement de l’individu ; et
- une étape de comparaison, par le ou les processeurs, des valeurs d’au moins un angle de pied calculées et de valeurs d’angles de pied prédéterminées, de façon à valider ou non la correction orthopédique.
- Lors de l’étape d’acquisition, l’au moins une centrale inertielle est positionnée contre le pied de l’individu. Comme cela sera illustré par la suite, cela peut permettre une amélioration de la justesse et de la précision.
- Il comporte une étape de calcul d’une correction effective, de préférence exprimée en degrés. Cela permet au praticien de quantifier la correction en degré par rapport à un déplacement de l’individu sans correction orthopédique.
- Il comporte en outre une étape d’acquisition de données de mouvement qui ont été générées, par au moins une centrale inertielle positionnée au niveau d’un pied de l’individu, lors d’un déplacement de l’individu en l’absence de correction orthopédique à valider. Ces données de mouvement générées en absence d’une correction peuvent être utilisées pour calculer les valeurs d’angles de pied prédéterminées utilisées lors de l’étape de comparaison. Alternativement, lorsque la correction orthopédique peut être fixée au pied, le chaussage devient inutile et la correction peut être placée contre le pied de l’individu tout comme la centrale inertielle.
- Il comporte en outre une étape de calcul d’un corridor de normalité, ledit procédé comportant alors les étapes suivantes exécutées par un ou plusieurs processeurs : une étape d’acquisition de données de mouvement qui ont été générées, par au moins une centrale inertielle positionnée au niveau d’un pied de l’individu, lors d’un déplacement de l’individu en l’absence de correction orthopédique à valider ; et une étape de calcul d’un corridor de normalité, à partir des données de mouvement acquises. Ce corridor de normalité peut être utilisé comme valeurs d’angles de pied prédéterminées lors de l’étape de comparaison. Avantageusement, lorsqu’un corridor de normalité est calculé il se substitue aux valeurs d’angles de pied attendues prédéterminées et permet d’améliorer la précision de la validation de la correction orthopédique.
- les valeurs d’angles de pieds prédéterminées sont des valeurs d’angles de pieds attendues qui ont été prédéterminées à partir de données relatives à la morphologie de l’individu et/ou de caractéristiques de l’article chaussant. Alternativement les valeurs d’angles de pieds attendues peuvent correspondre à des valeurs standard pour tout individu sans prendre en compte les caractéristiques morphologiques de l’individu. Toutefois, de façon préférée, les valeurs d’angles de pieds prédéterminées sont prédéterminées au moins en partie à partir des valeurs d’angle de pied observées en absence de correction, éventuellement modifiées.
- l’étape d’acquisition de données de mouvement comporte l’acquisition de données de mouvement générées par deux centrales inertielles chacune positionnée respectivement au niveau d’un pied de l’individu. Avantageusement, la centrale inertielle est en mesure d’acquérir des données d’accélération et de vitesse angulaire chacune sur trois axes. Cela permet d’évaluer simultanément la correction orthopédique de chacun des deux pieds de l’individu.
- Il comporte une étape de positionnement d’au moins une centrale inertielle au niveau du pied de l’individu. En particulier, il comporte une étape de positionnement d’au moins une centrale inertielle au niveau du pied de l’individu auquel est appliqué la correction orthopédique. Ce positionnement au niveau du pied peut par exemple comporter la fixation, par exemple via une substance adhésive, de la centrale inertielle sur le pied. Le positionnement peut être réalisé aussi sur l’article chaussant ou dans une semelle de l’article chaussant.
- Il comporte une étape de génération des données de mouvement durant laquelle l’au moins une centrale inertielle est positionnée contre le pied de l’individu, sur l’article chaussant ou dans une semelle de l’article chaussant. Ainsi, le procédé peut être mené directement chez le praticien avec dans un premier temps le positionnement de la ou des centrales inertielles, la génération des données lors d’un déplacement (p. ex. marche ou course) puis dans un intervalle de temps inférieur à 10 minutes, la validation ou non de la correction orthopédique. En outre, une telle solution ne nécessite pas un environnement laboratoire normé, mais seulement une surface plane permettant le déplacement de l’individu ou un tapis roulant.
- l’étape de comparaison comporte un calcul d’une valeur de déviation des valeurs d’angle de pied calculées par rapport aux valeurs d’angles de pied prédéterminées. Lorsque les valeurs d’angles de pied prédéterminées correspondent à des valeurs d’angles de pied attendue, la génération d’une valeur de déviation permet de quantifier dans quelle mesure la correction orthopédique n’est pas conforme aux besoins de l’individu. Alternativement, lorsque les valeurs d’angles de pied prédéterminées correspondent à des valeurs d’angles de pied sans correction, la génération d’une valeur de déviation permet de quantifier dans quelle mesure la correction orthopédique a entrainé une modification suffisante de la démarche de l’individu.
- les données de mouvement comportent des valeurs d’accélération et de vitesse angulaire selon trois axes. Ces données permettent d’améliorer la précision de la validation de la correction orthopédique. Ces données peuvent aussi comporter les dérivées et intégrales de ces grandeurs physiques.
- les valeurs d’au moins un angle de pied calculées et comparées comportent des valeurs d’angles sélectionnés parmi : un angle de l’axe antéro-postérieur du pied par rapport à sa ligne de progression, un angle de l’axe antéro-postérieur du pied par rapport à un plan formé par le sol, un angle de l’axe transversal du pied par rapport à sa ligne de progression ou un angle de l’axe transversal du pied par rapport à un plan formé par le sol. L’utilisation de ces angles particuliers permet d’améliorer la précision de la validation de la correction orthopédique.
- les valeurs d’angle de pieds d’au moins trois instants du déplacement, de préférence d’au moins cinq instants du déplacement, sont calculées puis comparées lors de l’étape de comparaison. L’utilisation de valeurs d’angle de pieds sur plusieurs instants du déplacement permet d’améliorer la précision de la validation de la correction orthopédique.
- le déplacement comporte au moins une phase d’oscillation et les valeurs d’au moins un angle de pieds calculées et comparées comportent au moins une valeur d’angle de pied obtenue à partir de données de mouvement générées pendant la phase d’oscillation. Cela permet d’améliorer la précision de la validation de la correction orthopédique et d’utiliser des données qui sont inaccessibles avec des technologies basées sur des capteurs de force. En effet, les modifications apportées par la correction orthopédique sur un pied au moment de la phase d’appui peuvent influer sur la phase oscillante de ce même pied ou sur la phase oscillante de l’autre pied.
- les valeurs d’angle de pieds sont calculées pour au moins vingt cycles de marche, de préférence au moins trente et de façon encore plus préférée au moins cinquante ; et les valeurs d’au moins un angle de pied calculées, utilisées lors de l’étape de comparaison, correspondent à des valeurs obtenues à partir d’au moins vingt cycles de marche, de préférence au moins trente et de façon encore plus préférée au moins cinquante. Ainsi, cela permet avantageusement de ne pas baser une validation sur une ou quelques prises de mesure, mais sur une pluralité de cycle de marche permettant d’augmenter la robustesse du procédé de validation selon l’invention. En particulier, les valeurs utilisées pour l’étape de comparaison correspondent à une moyenne ou une médiane des valeurs obtenues pour les différents cycles de marche considérés.
- les valeurs d’angle de pieds sont calculées pour une pluralité de cycle de marche qui ont été au préalable sélectionnés sur la base d’une ou de plusieurs caractéristiques calculées du cycle de marche ; la ou lesdites caractéristiques calculées du cycle de marche comportant : une valeur d’accélération maximale, une valeur de vitesse de propulsion maximale, une fréquence de pas, une longueur de pas, une vitesse de marche, une durée de la phase d’appui, et/ou une durée de la phase oscillante.
- au moins une centrale inertielle, ladite centrale inertielle étant agencée pour être positionnée au niveau d’un pied de l’individu et étant configurée pour générer des données de mouvement ;
- un ou plusieurs processeurs configurés pour :
- Acquérir des données de mouvement générées par l’au moins une centrale inertielle positionnée au niveau du pied de l’individu, lors d’un déplacement de l’individu en présence de la correction orthopédique à valider ;
- Calculer à partir des données de mouvement acquises, une valeur d’au moins un angle de pied pour plusieurs instants du déplacement ; et
- Comparer des valeurs d’au moins un angle de pied calculées et de valeurs d’angles de pied prédéterminées, de façon à valider ou non la correction orthopédique.
En particulier, le système de validation d’une correction orthopédique selon l’invention peut comporter deux boitiers électroniques comportant chacun au moins une des centrales inertielles et un dispositif informatique comportant le un ou plusieurs processeurs, lesdits boitiers électroniques comportant des moyens de communication configurés pour transmettre, de préférence en temps réel, les données de mouvement au dispositif informatique.
[Tableau 1]
| Positionnement de la centrale inertielle | Sensibilité | Spécificité |
| Contre le pied de l’individu | 0,95 | 0,91 |
| Sur la languette de la chaussure | 0,88 | 0,78 |
| Dans la semelle | 0,92 | 0,89 |
| Dans la correction orthopédique | 0,89 | 0,90 |
Le tableau 1 illustre la sensibilité et la spécificité d’un procédé de validation selon l’invention en fonction du positionnement de la centrale inertielle. Les données de sensibilité et spécificité peuvent être obtenues par comparaison avec les données de validation obtenues par des moyens classiques de l’état de la technique (c.-à-d. avis de validation d’un praticien).
- une étape de positionnement 110 d’une centrale inertielle au niveau d’un pied de l’individu, de préférence contre le pied de l’individu, de façon plus préférée au niveau des métatarses ;
- une étape d’acquisition 122 de données de mouvement générées, par au moins une centrale inertielle 11 positionnée au niveau d’un pied de l’individu, lors d’un déplacement de l’individu en absence de la correction orthopédique à valider ;
- une étape de chaussage 130a des pieds de l’individu dans au moins un article chaussant 30 comportant la correction orthopédique 40 à valider ou un positionnement de la correction orthopédique 40 sur au moins un pied de l’individu ;
- une étape d’acquisition 140 de données de mouvement qui ont été générées, par au moins une centrale inertielle 11 positionnée au niveau d’un pied de l’individu, lors d’un déplacement de l’individu en présence de la correction orthopédique à valider ;
- une étape de calcul 150, par un ou plusieurs processeurs 22, à partir des données de mouvement acquises, d’une valeur d’au moins un angle de pied pour plusieurs instants du déplacement de l’individu ; et
- une étape de comparaison 160, par un ou plusieurs processeurs 22, des valeurs d’au moins un angle de pied calculées et de valeurs d’angles de pied prédéterminées, de façon à valider ou non la correction orthopédique 40.
- des valeurs d’angles de pied de référence par exemple issues de la littérature ;
- des valeurs d’angles de pied calculés lors d’un déplacement de l’individu sans correction ;
- des valeurs d’angles de pied calculés lors d’un déplacement de l’individu sans correction, mais corrigées par exemple par des valeurs liées à la morphologie de l’individu.
- Acquérir des données de mouvement générées par l’au moins une centrale inertielle 11 positionnée au niveau d’un pied de l’individu ;
- Calculer à partir des données de mouvement acquises, une valeur d’au moins un angle de pied pour plusieurs instants du déplacement ; et
- Comparer des valeurs d’au moins un angle de pied calculé et de valeurs d’angles de pied prédéterminées, de façon à valider ou non la correction orthopédique.
Claims (13)
- Procédé (100) de validation d’une correction souhaitée à apporter par une correction orthopédique (40) pour un individu présentant au moins une affection causée par une cinétique anormale de déplacement de pied, ladite validation étant destinée à confirmer que ladite correction orthopédique entraine la correction souhaitée de la cinétique des pieds dudit individu lors du déplacement dudit l’individu, ledit procédé comprenant :
- une première étape d’acquisition (122) de données de mouvement de pied dans l’espace, qui ont été générées pour une pluralité d’instants de la pose du pied, par au moins une centrale inertielle (11) positionnée au niveau d’au moins un pied de l’individu, dans le cadre d’un déplacement de l’individu en l’absence de la correction orthopédique (40) à valider, dites données de mouvement d’initialisation, les données de mouvement de pied étant générées depuis l’instant de pose du talon jusqu’à l’instant de pose des orteils et/ou depuis l’instant de décollage du talon jusqu’à l’instant de décollage des orteils,
- une première étape de calcul (120), par un ou plusieurs processeurs (22), d’au moins une valeur prédéterminée d’angle de pied pour plusieurs instants du déplacement de l’individu sans correction orthopédique (40) à valider, à partir des données de mouvement d’initialisation,
- une deuxième étape d’acquisition (140) de données de mouvement de pied dans l’espace, qui ont été générées pour une pluralité d’instants de la pose du pied, par au moins ladite centrale inertielle (11) positionnée au niveau dudit pied de l’individu, dans le cadre d’un déplacement de l’individu en présence de la correction orthopédique (40) à valider, dites données acquises ;
- une deuxième étape de calcul (150), par un ou plusieurs processeurs (22), d’au moins une valeur calculée d’angle de pied pour plusieurs instants du déplacement de l’individu en présence de la correction orthopédique (40) à valider, à partir des données de mouvement de pied acquises ; et,
- une étape de validation de la correction souhaitée apportée par la correction orthopédique (40), l’étape de validation comprenant une étape de comparaison (160), par le ou les processeurs (22), d’au moins une valeur calculée d’angle de pied et d’au moins une valeur prédéterminée d’angle de pied. - Procédé (100) de validation d’une correction orthopédique (40) selon la revendication 1, caractérisé en ce que, lors de la deuxième étape d’acquisition (140) de données de mouvement de pied dans l’espace, qui ont été générées lors d’un déplacement de l’individu en présence de la correction orthopédique à valider, l’au moins une centrale inertielle (11) est positionnée contre le pied de l’individu.
- Procédé (100) de validation d’une correction orthopédique (40) selon l’une des revendications 1 ou 2, caractérisé en ce que la première étape de calcul (120) comporte en outre une étape de calcul d’un corridor de normalité de ligne de pression plantaire, à partir des données de mouvement d’initialisation, ledit corridor de normalité de ligne de pression plantaire étant obtenu à partir d’un ensemble de valeurs d’angle que le pied dudit individu présente, en une pluralité d’instants du déplacement sans correction, au cours d’un cycle de marche sans que sa marche ne soit considérée comme anormale, ledit corridor de normalité de ligne de pression plantaire étant utilisé comme valeurs d’angles de pied prédéterminées.
- Procédé (100) de validation d’une correction orthopédique selon l’une quelconque des revendications 1 à 3, caractérisé en ce que les valeurs d’angles de pieds prédéterminées sont des valeurs d’angles de pieds attendues qui ont été prédéterminées à partir de données relatives à la morphologie de l’individu.
- Procédé (100) de validation d’une correction orthopédique selon l’une quelconque des revendications 1 à 4, caractérisé en ce que les valeurs d’angles de pieds prédéterminées sont des valeurs d’angles de pieds attendues qui ont été prédéterminées à partir de caractéristiques de l’article chaussant.
- Procédé (100) de validation d’une correction orthopédique selon l’une quelconque des revendications 1 à 5, caractérisé en ce que dans la première étape d’acquisition (122) et la deuxième étape d’acquisition (140) de données de mouvement de pied dans l’espace, les données de mouvement de pied sont générées par deux centrales inertielles (11), chacune étant positionnée respectivement au niveau d’un pied de l’individu.
- Procédé (100) de validation d’une correction orthopédique (40) selon l’une quelconque des revendications 1 à 6, caractérisé en ce que l’étape de comparaison (160) comporte un calcul d’une valeur de déviation des valeurs d’angle de pied calculées par rapport aux valeurs d’angles de pied prédéterminées.
- Procédé (100) de validation d’une correction orthopédique (40) selon l’une quelconque des revendications 1 à 7, caractérisé en ce que les valeurs d’angle de pieds d’au moins trois instants du déplacement, de préférence d’au moins cinq instants du déplacement, sont calculées puis comparées lors de l’étape de comparaison (160).
- Procédé (100) de validation d’une correction orthopédique (40) selon l’une quelconque des revendications 1 à 8, caractérisé en ce que le déplacement comporte au moins une phase d’oscillation et en ce que les valeurs d’au moins un angle de pieds calculées et comparées comportent au moins une valeur d’angle de pied obtenue pendant la phase d’oscillation.
- Procédé (100) de validation d’une correction orthopédique (40) selon l’une quelconque des revendications 1 à 9, caractérisé en ce que les valeurs d’angle de pieds sont calculées pour au moins vingt cycles de marche ; et les valeurs d’au moins un angle de pied calculées, utilisées lors de l’étape de comparaison (160), correspondent à des valeurs obtenues à partir d’au moins vingt cycles de marche.
- Procédé (100) de validation d’une correction orthopédique (40) selon l’une quelconque des revendications 1 à 10, caractérisé en ce que les valeurs d’angle de pieds sont calculées pour une pluralité de cycle de marche qui ont été au préalable sélectionnés sur la base d’une ou de plusieurs caractéristiques calculées du cycle de marche ; la ou lesdites caractéristiques calculées du cycle de marche comportant : une valeur d’accélération maximale, une valeur de vitesse de propulsion maximale, une fréquence de pas, une longueur de pas, une vitesse de marche, une durée de la phase d’appui, et/ou une durée de la phase oscillante.
- Système (1) de validation d’une correction souhaitée à apporter par une correction orthopédique (40) pour un individu présentant au moins une affection causée par une cinétique anormale de déplacement de pied, ladite validation étant destinée à confirmer que ladite correction orthopédique entraine la correction souhaitée de la cinétique des pieds dudit individu lors du déplacement dudit l’individu, ledit système comportant :
- au moins une centrale inertielle (11), ladite centrale inertielle étant agencée pour être positionnée au niveau d’un pied de l’individu et étant configurée pour générer des données de mouvement de pied dans l’espace, pour une pluralité d’instants de la pose du pied, dans le cadre d’un déplacement de l’individu en l’absence de la correction orthopédique (40) à valider, dites données de mouvement d’initialisation, les données de mouvement de pied étant générées depuis l’instant de pose du talon jusqu’à l’instant de pose des orteils et/ou depuis l’instant de décollage du talon jusqu’à l’instant de décollage des orteils ;
- un ou plusieurs processeurs (12,22) configuré pour :
- acquérir des données de mouvement de pied dans l’espace, qui sont générées par l’au moins une centrale inertielle positionnée au niveau du pied de l’individu, lors d’un déplacement de l’individu en l’absence de la correction orthopédique (40) à valider,
- calculer au moins une valeur d’angle de pied prédéterminée pour plusieurs instants du déplacement sans correction, à partir des données de mouvement d’initialisation ;
- acquérir des données de mouvement de pied dans l’espace, qui sont générées par l’au moins une centrale inertielle positionnée au niveau du pied de l’individu, lors d’un déplacement de l’individu en présence de la correction orthopédique à valider ;
- calculer une valeur d’au moins un angle de pied pour plusieurs instants du déplacement, à partir des données de mouvement de pied acquises ; et
- valider la correction souhaitée apportée par la correction orthopédique (40) en comparant des valeurs d’au moins un angle de pied calculées et de valeurs d’angles de pied prédéterminées. - Système (1) de validation d’une correction orthopédique (40) selon la revendication 12, caractérisé en ce qu’il comporte deux boitiers électroniques (10) comportant chacun au moins une des centrales inertielles (11) et un dispositif informatique (20) comportant le un ou plusieurs processeurs (22), lesdits boitiers électroniques (10) comportant des moyens de communication configurés pour transmettre, de préférence en temps réel, les données de mouvement de pied au dispositif informatique (20).
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| FR2111183A FR3128366A1 (fr) | 2021-10-21 | 2021-10-21 | Procede et systeme de validation d’une correction orthopedique pour un individu |
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