WO2009088238A4 - Artificial knee joint for preventing ligament injury - Google Patents

Abstract

This invention relates to an artificial knee joint which can prevent the injury of a ligament and replace a natural knee joint. More particularly, this invention relates to an artificial knee joint which includes: a femur joint member which is joined to an end portion of a tibia near a femur; a tibia joint member which is joined to an end portion of the femur near the tibia; and a bearing member which is placed between the femur and tibia joint members. A chamber is formed at an end portion of a posterior condyle in the femur joint member to prevent the injury of a ligament caused by the flection of the femur joint member in the case of knee exercise. In addition, a CR type operation is used in the insertion of the artificial knee joint in order to preserve the posterior cruciate ligament. At this time, as there is the possibility that the posterior cruciate ligament may be injured due to the flection of the femur joint member, an additional chamber is formed at an inner side of an end portion in the posterior condyle. Furthermore, a chamber is formed at a posterior protrusion in the bearing member to prevent a ligament from colliding against the bearing. Consequently the injury of the ligament can be prevented. For this purpose, the artificial knee joint includes: the femur joint member that is joined to an end portion of a tibia near a femur; the tibia joint member that is joined to an end portion of the femur near the tibia; and the bearing member that is placed between the femur and tibia joint members, the end portion of the posterior condyle at the femur joint member includes an external chamber to prevent the collision of a lateral ligament against the femur joint member. Provided is an artificial knee joint that is able to prevent injury to a ligament.

Description

Artificial knee joint to prevent ligament damage

The present invention relates to an artificial knee joint capable of replacing a knee joint, and more particularly, to an artificial knee joint capable of replacing a knee joint, and more particularly to an artificial knee joint capable of replacing a knee joint, And a bearing member positioned between the tibia joint member and the tibia joint member, wherein a chamfer is formed at an end of a posterior condyle of the femur joint member to prevent a ligament injury when there is movement of the knee, To an artificial knee joint capable of preventing the femur joint member from damaging the ligament due to twisting rotation and the like. In addition, the artificial knee joint of the present invention is performed in the CR type when the artificial knee joint maintains the posterior cruciate ligament. In this case, there is a possibility of damaging the posterior cruciate ligament due to the twist rotation of the femur joint member. It is possible to prevent the ligament from being damaged by forming a chamfer at the rear protrusion portion of the bearing member to prevent the ligament from being hit.

Among the myriad of joints that make up the body, the knee joint is the joint between the tibia and the femur, and the number of patients who are in an unrecoverable condition is increasing due to wear of the knee, aging of the bone tissue, and accidents. The knee joint is a joint between the lower part of the femur and the upper part of the tibia and the back of the patella (knee bone). It serves to bend the leg backward from the knee.

The back of the patella is covered with cartilage with a thickness of 4 mm to 6 mm. During the bending and bending of the knee, the knee of the thighbone (femur) is moved up and down the joint surface of the thigh bone (femur) Improves strength. The pressure applied to the patellar-femur joints when walking on the ground corresponds to half of the weight, and when climbing the stairs, the weight is multiplied by three times, and when squatting occurs, eight times the weight. The joint capsule begins at the lower edge of the femur and is attached to the edge of the upper tibia. In addition, strengthening of the bones is strengthened by many durable ligaments, including the medial and lateral collateral ligaments, the sphincter ligaments in the capsular bag, and the direction and range of motion are limited.

The symptoms of the meniscus of the knee joint are as follows: The meniscus is located between the femur and the tibia, which is located between the femur and the tibia. The knee joint is located between the joint cartilage to cushion the impact of the knee joint. Provides the stability of the joint, smoothes the movement of the knee joint, and transmits the weight load.

The medial meniscus is usually composed of medial meniscus and lateral meniscus cartilage. In Europe and Americans, the medial meniscus is larger and less mobile than the lateral meniscus. However, it is easily damaged and the medial meniscus is damaged. In Korea, however, Are known to be many.

The damage to the meniscus is one of the most frequent injuries to the knee joints, often occurring during sports, mountain climbing or everyday life. When the knee is flexed, a rotational motion is applied, that is, when a torsional force is generated in the knee joint, it is good. If severe external force is applied, it may be accompanied with injuries such as cruciate ligament, collateral ligament, tibial fracture.

Most of the pathologies that occur in these patellae can cause symptoms without any special trauma, which is caused by structural defects of patellofemoral joints. When the leg is bent abnormally outward or when the foot is severely turned outward, excessive force is applied to the patellar-femur joint repeatedly, resulting in cartilage softening, and even when the knee joint is not used for a long time, Building. If there is a structural abnormality in the patellar-femoral joint, an orthosis that stabilizes the patella can be worn, and if the damage is severe, a surgical treatment method that replaces it with an artificial knee joint may be performed.

Recently, replacement of artificial joints has been widely performed in patients who are unable to recover due to serious damage to their joints. Metal, ceramic, or polyethylene is used for the articular joints of these artificial joints, Biocompatibility. Generally, an artificial knee joint is divided into a femur part and a tibial part, and a bearing part which is a part corresponding to a cartilage between a femur part and a tibia part. Here, the femur part and the tibia part are mainly made of a metal alloy, and the cartilage part is made of polyethylene and the like. The tibial part is fixed by an insertion part which is inserted into the knee joint side end of the tibia. The insertion part is fixed by the bone marrow of the tibia. However, when a repeated load is applied to the knee joint, it is difficult to achieve a sufficient effect due to a structural defect of the artificial knee joint, and the femur portion and the tibia portion are damaged by a continuous load, Resulting in a large problem.

In the case of such a conventional artificial knee joint, as shown in the conventional artificial knee joint shown in FIG. 1, first a part of the tibial side end of the femur 1 is cut and the femur joint member 10 is fixed by being engaged, A part of the distal end of the femur is cut, and the tibia joint member 30 is engaged and fixed to that portion. The bearing member 50 is positioned therebetween so that the contact portion 13 of the femur joint member 10 and the groove portion 51 located on the upper surface of the bearing member 50 come into contact with each other and the flexion of the knee joint . However, in the conventional artificial knee joint thus combined, as shown in the elevation view in FIG. 1, the femur joint member 10 is allowed to move only in the forward and backward directions when bending the upper surface of the bearing member 50 no. That is, when the artificial knee joint is performed, the knee joint of the human body does not only move forward and backward but also slightly twist the rotation of the tibia. Accordingly, the bearing member 50 50 in the plane of the upper surface. This plane twist rotation causes the end of the posterior condyle of the femur joint member 10 to collide with the ligament present on the side surface, and eventually to damage the lateral ligament.

Conventional artificial knee joint procedures include CR type and PS type. Here, the CR type is a type of artificial knee joint when the artificial knee joint is removed without removing the posterior cruciate ligament, and the PS type is a posterior cruciate ligament And the posterior cruciate ligament is replaced with a post of a bearing member. When the artificial knee joint is operated, the femur joint member collides with the side ligaments when the femur joint member is twisted and rotated in a plane on the upper surface of the bearing member due to the outer edges of both ends of the rear joint of the femur joint member, . Although the PS type artificial knee joint is replaced with the posterior cruciate ligament removed due to the cam of the bearing member and the femur joint member, there is no fear of damage to the posterior cruciate ligament in the central part, Type artificial knee joint, the artificial knee joint is performed while maintaining the posterior cruciate ligament. Therefore, when the femur joint member makes a twist rotation on the upper surface of the bearing member, the inner joint edge of the femur joint member The posterior cruciate ligament is damaged.

In addition, in the conventional artificial knee joint bearing member, when the knee is fully extended, there is a slight forward bending even if the knee protrudes at a low height, so that the back ligament of the bearing member, . As a result, the posterior ligaments may be damaged, accompanied by pain, and seriously illness caused by inflammation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an artificial knee joint having a femur joint member having an outer edge of a femur joint member, In the artificial knee joint according to the present invention, an outer chamfer is included at the outer edge of the end of the rear joint of the femur joint member to prevent collision with the side ligaments, To provide an artificial knee joint.

Another object of the present invention is to provide a CR type artificial knee joint having a posterior cruciate ligament in the inside thereof colliding with an inner edge of the femur joint member along the horizontal axis of the femur joint member, The present invention also provides an artificial knee joint which prevents the ligament from being damaged by preventing collision with the posterior cruciate ligament by including an inner chamfer on the inner edge of the distal end of the femur joint member.

It is a further object of the present invention to provide a knee prosthesis in which, when the knee joint is fully extended in a conventional artificial knee joint, there is a slight forward bending, so that the ligament of the ligament collides with the rear protrusion of the bearing member, The present invention provides an artificial knee joint which can prevent ligament damage by including a rear chamfer at a rear protruding portion of the bearing member to prevent the ligament damage.

It is a further object of the present invention to provide a femoral joint member and a bearing member which are capable of preventing pain from being caused by collision with the ligament in a conventional artificial knee joint and causing serious inflammation, To provide a more stable artificial knee joint.

In order to achieve the above-mentioned object, the present invention will be realized by an embodiment having the following configuration, and includes the following configuration.

According to an embodiment of the present invention, an artificial knee joint according to the present invention includes a femur joint member coupled to a distal end of a femur, a tibia joint member coupled to a distal end of the tibia, and a femur joint member connected between the femur joint member and the tibia joint member Wherein the femur joint member includes an outer chamfer chamfered at an outer edge of an end of the rear joint to prevent collision with a lateral ligament to thereby prevent ligament damage .

According to another embodiment of the present invention, the femur joint member of the artificial knee joint according to the present invention further includes an inner chamfer chamfered at the inner edge of the end of the rear joint to prevent collision with the posterior cruciate ligament, And the like.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is characterized in that the outer chamfer is chamfered in a gently convex curved shape.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is characterized in that the inner chamfer is chamfered into a gentle concave curved shape embedded inward.

According to another embodiment of the present invention, the artificial knee joint according to the present invention includes a rearward protruding portion that protrudes upward from the rear of the bearing member, and the rear protruding portion includes a rear chamfer formed by being chamfered to a certain depth downwardly , And the rear chamfer is capable of preventing collision with the ligament.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is characterized in that the rear chamfer is chamfered into a gently curved shape recessed and embedded.

According to another embodiment of the present invention, an artificial knee joint according to the present invention includes a femur joint portion coupled to a distal end of a femur, wherein the femur joint member is chamfered in a gently convex curved shape at an outer edge of an end of a rear joint of the femur joint member It is characterized by preventing the collision of the ligament by preventing collision with the lateral ligament including the outer chamfer.

According to another embodiment of the present invention, the femur joint member according to the present invention further comprises a chamfered inner chamfer which is gently curved inwardly recessed inwardly from an inner edge of a rear end of the femur joint member And prevents collision with the posterior cruciate ligament, thereby preventing damage to the ligament.

According to another embodiment of the present invention, an artificial knee joint according to the present invention is a bearing member positioned between a femur joint member and a tibia joint member, the bearing member including a rear protrusion protruding upward from a rear side thereof , The rear projecting portion includes a rear chamfer chamfered in a gently curved shape embedded in a concave shape, and the rear chamfer is characterized in that collision with the ligament can be prevented.

According to another embodiment of the present invention, the artificial knee joint according to the present invention further includes a front protruding portion that protrudes upward from the front of the bearing member, and the front protruding portion is formed higher than the height of the rear protruding portion, Knee motion and anterior dislocation can be prevented.

INDUSTRIAL APPLICABILITY As described above, the present invention can achieve the following effects according to the above-described problem solving means and the construction and operation to be described later.

In the present invention, the lateral ligament collides with the femur joint member by the outer edge of the femur joint member in the conventional artificial knee joint due to the horizontal axis rotation in the plane, and the ligament is damaged. In the artificial knee joint according to the present invention The femur joint member includes an outer chamfer at the outer edge of the distal end of the rear joint to prevent collision with the side ligaments, thereby preventing ligament damage.

In the present invention, there is a problem that the ligament is damaged because the posterior cruciate ligament existing in the inside of the conventional CR type artificial knee joint collides with the inner edge along the horizontal axis rotation of the femur joint member, An inner chamfer is included in the inner edge of the distal end of the rear joint member to prevent collision with the posterior cruciate ligament, thereby preventing the ligament from being damaged.

In the present invention, when the knee joint is completely extended in the conventional artificial knee joint, there is a slight forward bending, so that the ligament of the ligament is damaged due to the collision of the posterior ligament with the rear projecting portion of the bearing member. It is possible to prevent the ligament damage by including the rear chamfer in the rear protruding portion of the bearing member.

In the present invention, a pain is caused by a collision with a ligament in a conventional artificial knee joint, and serious diseases are caused by inflammation. In order to prevent this disease, a chamfer is provided on the femur joint member and the bearing member, It is possible to achieve a more stable artificial knee joint without involving pain.

1 is a view showing a state in which a conventional artificial knee joint is practiced

2 is a rear view of a femur joint member of a conventional PS type artificial knee joint;

3 is a rear view of a femur joint member of a conventional CR type artificial knee joint

Fig. 4 is a view showing the horizontal twist rotation on the plane of the artificial knee joint of the related art

FIG. 5 is a view showing the horizontal twist rotation of a conventional artificial knee joint on a plane; FIG.

6 is a rear view of a femur joint member of a PS type artificial knee joint according to an embodiment of the present invention

7 is a rear view of a femur joint member of a CR type artificial knee joint according to an embodiment of the present invention.

8 is a perspective view of a bearing member in an artificial knee joint according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the constitution and preferred embodiments of an artificial knee joint apparatus for preventing ligament damage according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a rear view of a femur joint member of a conventional PS type artificial knee joint, FIG. 3 is a rear view of a femur joint member of a conventional CR type artificial knee joint, and FIG. 4 is a cross- FIG. 6 is a rear view of a femur joint member of a PS type artificial knee joint according to an embodiment of the present invention, and FIG. 7 is a cross- FIG. 8 is a perspective view of a bearing member in an artificial knee joint according to another embodiment of the present invention. FIG. 8 is a rear view of a femur joint member of a CR type artificial knee joint according to an embodiment.

Before describing the artificial knee joint according to the present invention, it should be noted that due to the outer edge 19a and the inner edge 19b of the rear articulation end 19 of the femur joint member 10 of the conventional artificial knee joint shown in Figs. 2 and 3 4 and 5, a description will be given of a problem caused by ligament damage due to twist rotation of the femur joint member 10 and the bearing member 50 in the plane abscissa of the conventional artificial knee joint shown in Figs. 4 and 5 . FIG. 2 shows a PS type femoral component 10 which is removed from a conventional artificial knee joint and is to be performed. The femur joint member 10 includes an outer edge 19a of the rear articulation end 4 and 5, when the femur joint member 10 has a planar abaxial twist rotation of the bearing member 50, the outer joint edge 19a of the rear articulation end protruding from the joint member 10 Collision with the lateral ligament. As a result, the lateral ligament can be damaged by frequent collision and friction, causing pain, and causing serious inflammation. 3 is a perspective view of a femur joint member 10 to be performed without removing the posterior cruciate ligament in the artificial knee joint according to the present invention. The femur joint member 10 has an inner edge 19b. As described above, when the femur joint member 10 is twisted according to the horizontal axis rotation of the bearing member 50, the inner side edge 19b of the rear articulation end collides with the intermediate posterior cruciate ligament. As a result, the posterior cruciate ligament is damaged, causing pain and inflammation. In order to solve these problems, the artificial knee joint according to the present invention forms a chamfer at the end of the rear articulation of the femur joint member to prevent it.

Hereinafter, the artificial knee joint according to the present invention will be described in detail with reference to FIGS. 6 to 8. FIG. The artificial knee joint of the present invention is a knee prosthesis having a femur joint member 100 coupled to the lower end of the tibia of the femur shown in Figs. 6 and 7 and a femur joint member 100 coupled to the femur joint member 100 and the tibia joint member shown in Fig. And a bearing member 500 serving as a bearing member. Accordingly, the femur joint member 100 rubs against the bearing member 500, and the bearing member receives a stress due to the load transmitted from the upper portion of the femur joint member. In addition, the femur joint member and the bearing member are in contact with each other. When the leg is moved due to the ligament, the tibia moves back and forth, and it can move left and right. Therefore, it is preferable that the contact portion of the femur joint member and the bearing member maintain various contact according to the curvature by the movement of the knee joint, in order to appropriately disperse the stress.

The femur joint member 100 is generally U-shaped and made of biocompatible material. The femur joint member 100 has a portion that can accommodate the femur in an upper portion thereof and a curved surface having various curvatures that are slightly spherical in the lower portion . The femur joint member 100 has a femur receiving part formed at an inner side of the U-shaped femur so that a part of the femur can be cut and accommodated in the femur joint member 100, And a fixing protrusion for allowing the fixing member to be firmly coupled. The femur joint member 100 further includes a curved bearing member contact portion 130 which is brought into contact with the bearing member 500 to be described later, And includes a cam 170 connected between both posterior condyles and includes a rear articulation end 190 positioned at the distal end of the articulation on the rear side of the femur joint member.

The femur receiving portion is a portion corresponding to the U-shaped upper inside of the femur joint member 100, and is firmly coupled to the lower incision surface of the femur. The surface of the femur receiving part may have a rough surface to be firmly coupled with the femur, or may be made of a porous material. The fixing protrusion is a protrusion formed to be inserted into the femur from the upper side of the femur receiving portion and is inserted into the femur so as to firmly hold the bone tissue of the femur, will be.

The bearing member contact portion 130 preferably has a shape that allows the contact area to be maximized when the femur moves in contact with the groove 510 of the bearing member 500 to be described later so that the stress can be naturally dispersed Do. Accordingly, the curvature of the contact portion when viewed from the side of the bearing member contact portion 130 is different from the curvature of the contact portion when viewed from the front portion. The curvature of the contact portion is different from that of the contact portion 130, The stress can be dispersed by increasing the contact area at the same time. Even if the abutment portion is slightly lifted, the stress is concentrated on the other side, To be dispersed.

In the case of a PS type artificial knee joint to be performed in a state where the artificial knee joint of the present invention is removed with the posterior cruciate ligament removed, the cam 170 may be replaced with a post (not shown) of the bearing member 500 570 of the femur joint member 100 in order to perform the function thereof. The cam 170 is present in a conventional PS type artificial knee joint, and a detailed description thereof will be omitted below.

The rear end of the femur joint member 100 may be a U-shaped end portion of the rear articulation joint member 100. The end of the rear articulation end portion 190 may form a chamfer, The ligament damage can be prevented. The distal end of the posterior joint 190 includes an outer chamfer 191 for preventing damage to the lateral ligament and an inner chamfer 193 for preventing damage to the posterior cruciate ligament in the case of a CR type artificial knee joint do.

6 and 7, the outer chamfer 191 has a chamfer formed at the outer edge 19a of the distal end of the conventional articular femur joint member 10 shown in FIG. 2. As shown in FIGS. 4 and 5, And when the femur joint member rotates in the horizontal axis of the bearing member in the horizontal axis, the outer edge 19a of the rear end of the rear joint protrudes to prevent the side ligament from being damaged. 6 and 7, it is preferable that the outer edge of the rear articulation end of the outer articulator 191 is formed in a gently curved shape as shown in FIGS. 6 and 7, The knee joint may be caught by the lateral ligament even though the chamfer is formed, and the smooth flexion of the knee joint may be interrupted. It is possible to prevent the side ligaments from being damaged even when the femur joint member 100 is twisted in the plane of the horizontal axis through the femur joint member 100 including the outer chamfer 191 .

7, the inner chamfer 193 is a chamfer formed at the inner edge of the rear articulation of the femur joint member in the CR type artificial knee joint of the prior art as shown in FIG. 7, and the inner side of the CR type artificial knee joint The femur joint member 100 functions to prevent the ligament damage without colliding with the posterior cruciate ligament in the center even if the femur joint member 100 has a horizontal axis rotation on the plane of the bearing member. It is preferable that the inner chamfer 193 is formed to have a gentle concave curved shape that is embedded inwardly in the groove 510 of the bearing member 500 in a state in which the femur joint member 100 is sufficiently bent Since the inner edge of the end 190 of the rear articular joint may collide with the posterior cruciate ligament when the horizontal twist and rotation of the horizontal plane is rotated, it is preferable that the most ideal shape for preventing the collision due to the twist rotation is closer to the circular shape. That is, the shape of the inner chamfer 193 is shaped to have a concave shape to prevent collision with the posterior cruciate ligament along the horizontal axis about the posterior cruciate ligament.

The bearing member 500 plays a role similar to the cartilage of the human body between the femur joint member 100 and the tibia joint member. Unlike the material of the femur joint member and the tibia joint member, It is preferable that the material is made of polyethylene so that the surface is smooth and natural friction contact is possible. The bearing member 500 has grooves 510 as viewed from the front where the contact portions 130 of the femur joint member 100 are in contact with the upper ends of both ends of the bearing member 500 as viewed from the side, The front projection 530 and the rear projection 540, In addition, when the artificial knee joint of the present invention is performed as a PS type, the posterior cruciate ligament may be removed, and the post 570 may be substituted for it.

The grooves 510 are depressed portions formed in both directions of the artificial knee joint according to the present invention when viewed from the front of the bearing member 500. The groove 510 is a recessed portion formed in the bearing member contact portion 130 of the femur joint member 100, And is frictioned when the femur joint member 100 rotates. Therefore, it is necessary to prevent the concentration of stress by maximizing the contact area because the load is concentrated on this portion due to the contact. Therefore, it is preferable that the groove 510 has a curvature corresponding to the bearing member contact portion 130 of the femur joint member 100. Accordingly, as described in the structure of the bearing member contacting portion 130, the stress is concentrated only by contacting only one side of the bearing member 130, and the effect of dispersing the stress due to the increase of the contact area can be achieved will be.

The front protruding portion 530 and the rear protruding portion 540 may be formed to protrude upward and forward at the front and back of the bearing member 500. The height of the front protruding portion 530 may be different from the height of the rear protruding portion 530, Is formed to be higher than the height of the protrusion 540 in order to prevent natural knee motion and anterior dislocation. The front protruding portion 530 and the rear protruding portion 540 protrude from the front and rear at a predetermined height when viewed from the side of the bearing member 500. Particularly, In order to prevent the femur joint member 100 from being detached from the bearing member 500 when the patient who has performed the artificial knee joint according to the present invention is bent at a large angle relative to the height of the knee joint 540, The rear protrusion 540 has a height lower than the height of the front protrusion 530 to prevent dislocation when the knee is bent and rolled back at a large angle, thereby enabling a stable movement of the knee joint. Therefore, when the knee is fully extended, the rear protruding portion 540 may bend slightly forward, thereby causing a collision between the rear protruding portion and the ligament on the rear side, thereby damaging the ligament. Therefore, 541).

The rear chamfer 541 is a core of the present invention, and even if the rear protrusion of the bearing member protrudes low, the back ligament may be damaged by the contact with the posterior ligament, resulting in pain and inflammation. In order to solve such a problem, a chamfer having a gently curved shape embedded in the concave recess as shown in FIG. 8 is formed on the rear protruding portion 540 so that the rear ligament can be prevented from colliding. As a result, collision with the posterior ligament can be prevented through the rear chamfer 541, and it is possible to realize the prevention of ligament damage, which is an object to be achieved by the present invention, thereby realizing a more stable artificial knee joint.

The post 570 protrudes upward in a central portion of the bearing member 500 to replace the role of the removed posterior cruciate ligament when the artificial knee joint of the present invention is performed as a PS type. The configuration of the post 570 is well known to those of ordinary skill in the art, and a detailed description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the operation and use state of an artificial knee joint device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 is a rear view of a femur joint member of a PS type artificial knee joint according to an embodiment of the present invention, FIG. 7 is a rear view of a femur joint member of a CR type artificial knee joint according to an embodiment of the present invention, Is a perspective view of a bearing member in an artificial knee joint according to another embodiment of the present invention.

6 to 8, an operation of the artificial knee joint according to an embodiment of the present invention will be described with reference to FIG. 6. Referring to FIG. 6, the articulated knee joint according to an embodiment of the present invention includes a femur joint member 100, The knee joint 190 includes the outer chamfer 191 to prevent collision with the side ligaments when the artificial knee joint of the present invention is performed to prevent the ligaments from being damaged. This is because the femur joint member in contact with the upper surface of the bearing member rotates in the twist axis of the horizontal axis not only in the back and forth movement of the human body but also in the back of the femur member, And the outer edge of the end is cut to form a chamfer. In addition, it is preferable that the outer chamfer 191 has a gently curved shape protruding outwardly. This minimizes the damage of the lateral ligaments when the femur joint member 100 is rotated in the horizontal direction on the plane, So that the knee joint can be flexibly rotated.

Referring to FIG. 7, the femur joint member 100 includes an inner chamfer 193 as well as an outer chamfer 191 at a distal end of a rear joint 190 according to another embodiment of the present invention. This is because the CR type artificial knee joint does not remove the posterior cruciate ligament but collides with the posterior cruciate ligament in the center by the transverse twist rotation of the femur joint member as described above, And the inner edge of the end of the rear joint is cut to form a chamfer. The femur joint member 100 may have a curved surface shape that is recessed and recessed inwardly inside the inner chamfer 193, It is most preferable to form the chamfer of the inner edge of the rear articular end 190 so as to be close to the circular shape about the axis.

8, the bearing member 500 of the present invention includes a rear chamfer 541, which is slightly bent forward when the actual knee is fully extended, There arises a problem that the back protrusion included in the bearing member 500 collides with the back ligament to damage the ligament on the back side. In order to solve this problem, the bearing member 500 of the present invention cuts the conventional rear projection to form the rear chamfer 541 so as not to collide with the ligament on the rear side. Further, it is preferable that the rear chamfer 541 is curved inwardly. Thus, the artificial knee joint for preventing the ligament damage of the present invention can be realized.

The embodiments described above are merely preferred embodiments of the artificial knee joint according to the present invention, which are well known to those skilled in the art (hereinafter referred to as " those skilled in the art "), And the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes, substitutions, and alterations can be made hereto without departing from the spirit of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are also included in the scope of the present invention.

Claims (10)

An artificial knee joint comprising: a femur joint member coupled to a distal end of a femur; a tibia joint member coupled to a distal end of the tibia; and a bearing member positioned between the femur joint member and the tibia joint member, Wherein the femur joint member includes an outer chamfer chamfered at an outer edge of an end of a rear joint to prevent collision with a side ligament, thereby preventing ligament damage. The method according to claim 1, Wherein the femur joint member further includes a chamfered inner chamfer at an inner edge of a distal end of the posterior joint to prevent collision with the posterior cruciate ligament to thereby prevent ligament damage. The artificial knee joint according to claim 1, wherein the outer chamfer is chamfered in a gently convex curved shape. [3] The artificial knee joint according to claim 2, wherein the inner chamfer is chamfered in a gentle concave curved shape embedded inward. 5. The method according to any one of claims 1 to 4, The bearing member includes a rear protruding portion protruding upward from a rear side of the bearing member, and the rear protruding portion includes a rear chamfer formed by chamfering the bottom portion to a certain depth, and the rear chamfer is capable of preventing collision with the ligament Artificial knee joint to prevent damage to ligaments. 6. The method of claim 5, Wherein the rear chamfer is chamfered in a gently curved shape embedded in a concave shape. In the femur joint portion which is connected to the distal end of the femur, A femur joint member for preventing a ligament injury by preventing a collision with a side ligament, including an outer chamfer chamfered in a gently convex curved shape at an outer edge of an end of a rear joint of the femur joint member. [8] The femur joint according to claim 7, wherein the femur joint member further includes a chamfered inner chamfer in a gentle concave curved shape embedded inward at an inner edge of an end of the rear joint to prevent collision with the posterior cruciate ligament, A femur joint member for preventing the femur joint from being damaged. A bearing member positioned between a femur joint member and a tibia joint member, wherein the bearing member includes a rearwardly projecting portion projecting upwardly from a rear side thereof, the rearwardly projecting portion including a rearwardly projecting portion Wherein the rear chamfer prevents collision with the ligament. [10] The apparatus according to claim 9, wherein the bearing member further includes a front protruding portion protruding upward from a front side of the bearing member, wherein the front protruding portion is formed higher than a height of the rear protruding portion to prevent natural knee movement and anterior dislocation Characterized by a bearing member.

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