CN111603279A - knee prosthesis - Google Patents

Abstract

The invention provides a knee joint prosthesis, comprising: a tibial plateau; a femoral condyle part, located above the tibial plateau; a spacer part, the spacer part is located between the tibial plateau and the femoral condyle part, and the spacer part includes a medial spacer and the lateral pad; the moving mechanism is arranged between the tibial platform and the lateral pad, and the lateral pad moves on the tibial platform through the moving mechanism. The technical solution of the present application effectively solves the problem of poor knee joint prosthesis in the related art.

Description

knee prosthesis

technical field

The present invention relates to the field of orthopedic implants, in particular, to a knee joint prosthesis.

Background technique

Artificial knee arthroplasty is the use of artificial material interfaces to replace the worn or diseased surface of the knee joint with the aim of eliminating pain, correcting joint deformities, and restoring patient mobility. Knee motion is a complex motion process. During flexion, the femoral condyle not only slides on the tibial plateau, but also rolls and rotates.

In the related art, the knee joint prosthesis can realize the slippage of the femoral condyle on the tibial plateau. When the above knee joint prosthesis is used for replacement surgery, the patient is prone to motor dysfunction.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a knee joint prosthesis to solve the problem of poor effect of the knee joint prosthesis in the related art.

In order to achieve the above object, according to one aspect of the present invention, a knee joint prosthesis is provided, comprising: a tibial plateau; a femoral condyle part, located above the tibial plateau; a spacer part, the spacer part is located on the tibial plateau and the femoral condyle part In between, the spacer component includes an inner spacer and an outer spacer; a moving mechanism is arranged between the tibial plateau and the outer spacer, and the outer spacer moves on the tibial plateau through the moving mechanism.

Further, the moving mechanism includes a rotation column and a rotation hole, one of the rotation column and the rotation hole is arranged on the tibial plateau, the other is arranged on the lateral pad, and the rotation column is inserted into the rotation hole and can be rotated.

Further, the tibial platform includes a mounting platform and a positioning column located at the bottom of the mounting platform, the rotation hole is located inside the positioning column, and the rotating column is located at the bottom of the lateral pad.

Further, the tibial platform includes an installation platform and a positioning column located at the bottom of the installation platform, the rotation hole is located at the bottom of the lateral pad, the rotation column is located above the tibial platform, and the rotation column and the positioning column are coaxially arranged.

Further, the moving mechanism includes an arc-shaped sliding rail and an arc-shaped sliding groove, one of the arc-shaped sliding rail and the arc-shaped sliding groove is arranged on the tibial plateau, the other is arranged on the outer spacer, and the arc-shaped sliding rail is located in the arc-shaped sliding rail. In the chute, the arc-shaped chute can slide relative to the arc-shaped sliding rail.

Further, the arc-shaped sliding groove is arranged on the bottom of the outer gasket, the arc-shaped sliding rail is arranged on the upper part of the tibial plateau, and at least one end of the arc-shaped sliding groove is an open end.

Further, the tibial plateau is provided with an enclosing portion, a part of the structure of the inner pad is located in the enclosing portion, the tibial plateau has a plane portion matched with the outer gasket, and the enclosing portion protrudes from the plane portion.

Further, the inner gasket includes a base body and a convex part located at the bottom of the base body, the convex part is located in the enclosure part, and the outer side wall of the base body is flush with the outer side wall of the enclosure part.

Further, an avoidance concave portion is provided on the enclosure portion, and the avoidance concave portion avoids the center position of the tibial plateau.

Further, the tibial platform further includes an anti-rotation wing, and the anti-rotation wing is connected with the installation platform and the positioning column; and/or, the contact surface between the tibial platform and the lateral pad is a polished surface.

Applying the technical scheme of the present invention, the femoral condyle component is installed above the tibial plateau, the spacer component includes a medial pad and an outer pad, and the medial and lateral pads are installed between the femoral condyle component and the tibial plateau, and the tibial plateau and the tibial plateau are installed. A moving mechanism is arranged between the outer gaskets, and the outer gasket can move under the action of the moving mechanism. By setting the above-mentioned moving mechanism, when the femoral condyle component slides, rolls or rotates, the lateral pad can move accordingly, so that the femoral condyle component and the lateral pad can cooperate with each other, so that the knee joint prosthesis can have more movement The shape of the knee joint prosthesis can be closer to the motion shape of the knee joint of the human body, so that the effect of the knee joint prosthesis is better.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 shows a schematic three-dimensional structure diagram of Embodiment 1 of the knee joint prosthesis according to the present invention;

FIG. 2 shows a schematic three-dimensional structure diagram of a partial structure of the knee joint prosthesis of FIG. 1;

Figure 3 shows a schematic top view of the knee joint prosthesis of Figure 2;

Fig. 4 shows the three-dimensional schematic diagram of the femoral condyle component of the knee joint prosthesis of Fig. 1;

Fig. 5 shows a three-dimensional schematic diagram of the tibial plateau of the knee joint prosthesis of Fig. 1;

Fig. 6 shows a schematic diagram of the exploded structure of the lateral spacer of the knee joint prosthesis of Fig. 1;

Fig. 7 shows a schematic diagram of the exploded structure of the medial spacer of the knee joint prosthesis of Fig. 1;

FIG. 8 shows a schematic bottom view of the enclosure of the knee joint prosthesis of FIG. 7;

FIG. 9 shows a schematic three-dimensional structure diagram of Embodiment 2 of the knee joint prosthesis according to the present invention;

Fig. 10 shows a three-dimensional schematic diagram of the lateral pad of the knee joint prosthesis of Fig. 9;

FIG. 11 shows a schematic three-dimensional structure diagram of the outer gasket of FIG. 10 from another perspective;

Fig. 12 shows a three-dimensional schematic diagram of the knee joint prosthesis according to the third embodiment of the present invention;

Fig. 13 shows a schematic perspective view of the lateral spacer of the knee joint prosthesis of Fig. 12; and

FIG. 14 shows a schematic bottom view of the outer spacer of FIG. 13 .

Wherein, the above-mentioned drawings include the following reference signs:

10, tibial platform; 11, installation platform; 12, positioning column; 13, enclosure part; 131, concave part; 132, notch; 14, plane part; 15, anti-rotation wing; 20, femoral condyle part; 30, spacer part ; 31, inner gasket; 32, outer gasket; 40, moving mechanism; 41, rotating column; 42, rotating hole; 43, arc slide rail; 44, arc chute; 441, open end.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise. Meanwhile, it should be understood that, for the convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific value should be construed as illustrative only and not as limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In order to enable the knee joint prosthesis to better simulate the kinematics of the human knee joint, in the first embodiment, as shown in FIGS. 1 to 5 , the knee joint prosthesis includes: a tibial plateau 10 , a femoral condyle component 20 , a pad The sheet member 30 and the moving mechanism 40 . The femoral condyle component 20 is positioned above the tibial plateau 10 . A spacer member 30 is located between the tibial plateau 10 and the femoral condyle member 20 , and the spacer member 30 includes a medial spacer 31 and a lateral spacer 32 . The moving mechanism 40 is disposed between the tibial plateau 10 and the lateral pad 32 , and the lateral pad 32 moves on the tibial plateau 10 through the moving mechanism 40 .

The technical solution of the first embodiment is applied, the femoral condyle component 20 is installed above the tibial plateau 10, the spacer component 30 includes a medial pad 31 and a lateral pad 32, and the medial pad 31 and the lateral pad 32 are mounted on the femoral condyle component 20. Between the tibial platform 10 and the tibial platform 10 , a moving mechanism 40 is provided between the tibial platform 10 and the lateral pad 32 , and the lateral pad 32 can move under the action of the moving mechanism 40 . By arranging the above-mentioned moving mechanism 40, when the femoral condyle member 20 slides, rolls or rotates, the lateral pad 32 can move accordingly, so that the femoral condyle member 20 and the lateral pad 32 cooperate with each other, so that the knee joint prosthesis can Having more motion forms enables the knee joint prosthesis to be closer to the motion form of the knee joint of the human body, thus making the knee joint prosthesis better.

The femoral condyle components include the medial condyle joint and the lateral condyle joint. The medial condyle joint cooperates with the medial spacer, and the lateral condyle joint cooperates with the lateral spacer. When the knee prosthesis is flexed, the medial condyle joint can be rotated externally (axis shift) and Motion characteristics of lateral condyle joint rolling backwards. The application of the knee joint prosthesis of this embodiment can improve postoperative satisfaction of patients and prolong the service life of the knee joint prosthesis.

Taking into account the difficulty of matching, the complexity of the structure and other issues, in the first embodiment, as shown in FIGS. 5 to 7 , the moving mechanism 40 includes a rotation column 41 and a rotation hole 42, and the rotation hole 42 is arranged on the tibial platform 10. The column 41 is provided on the outer spacer 32, and the rotating column 41 is inserted into the rotating hole 42 and can be rotated. The rotating hole 42 of the rotating column 41 has a simple structure and good matching effect. When the rotating column 41 is inserted into the rotating hole 42, the outer gasket 32 rotates under the cooperation of the rotating column 41 and the rotating hole 42, thereby making the femoral condyle part 20 can not only slide and roll on the spacer member 30 but also rotate, so that the knee joint prosthesis can simulate the movement mode of the physiological knee joint.

As shown in FIGS. 1 , 2 and 5 , in the first embodiment, the tibial platform 10 includes a mounting platform 11 and a positioning column 12 located at the bottom of the mounting platform 11 , the rotation hole 42 is located inside the positioning column 12 , and the rotating column 41 is located at the bottom of the mounting platform 11 . Bottom of outer spacer 32. The rotation hole 42 is located inside the positioning column 12, which can effectively protect the rotation column 41, prevent the rotation column 41 from being exposed, and prevent it from interfering with other structures such as ligament and soft tissue, thereby deteriorating the surgical effect of the patient. The positioning post 12 is conducive to the conduction of mechanics.

As shown in FIG. 6 , the rotating column 41 includes a first conical matching surface located at the bottom end, and the first conical matching surface is convenient for the plug-fit of the rotating column 41 . The upper part of the first conical matching surface is a rotating matching surface, which is matched with the inside of the rotating hole 42, and the rotating matching surface is mainly realized here, and the rotating matching surface is a cylindrical surface. A second conical matching surface is provided above the rotating matching surface. The rotation hole 42 is adapted to the shape of the rotation column 41 , and the rotation hole includes a first inner conical surface, a cylindrical surface and a second inner conical surface. The first inner tapered surface is matched with the first tapered matching surface, the two cylindrical surfaces are matched with each other, and the second inner tapered surface is matched with the second tapered matching surface. The rotation of the rotating column 41 is made more stable. The length of the rotation column 41 is relatively long, and the length of the up and down movement of the knee joint prosthesis is much smaller than the length of the rotation column 41, so the rotation column 41 can be prevented from being detached from the rotation hole 42, thereby making the outer spacer 32 move during the movement. , the outer gasket 32 will not dislocate.

As shown in FIG. 7 and FIG. 8 , in the first embodiment, the tibial platform 10 is provided with an enclosure portion 13 , and a part of the structure of the medial spacer 31 is located in the enclosure portion 13 , and the tibial plateau 10 has a matching with the outer spacer 32 . The plane portion 14 is formed, and the enclosure portion 13 protrudes from the plane portion 14 . The setting of the enclosure portion 13 can effectively limit the movement of the medial spacer 31 and prevent it from being detached from the tibial plateau 10 . There is no surrounding structure on the flat portion 14, and the lateral spacer 32 can move on the flat portion, so that the femoral condyle component 20 can be rotated.

In order to prevent the medial spacer from being disengaged and to make the contact between the medial spacer and the femoral condyle components more closely, as shown in FIGS. 7 and 8 , in the first embodiment, the medial spacer 31 includes a base body and a bottom located on the base body. The convex part is located in the enclosure part 13 , and the outer side wall of the base body is flush with the outer side wall of the enclosure part 13 . The raised portion can limit the medial washer 31 in the enclosure portion 13, and the size of the base body is the same as that of the enclosure portion, so that the contact area between the medial washer 31 and the femoral condyle member 20 can be larger, and further Makes the movement of the knee prosthesis more stable. At the same time, a protrusion is provided on the protruding portion, and a notch 132 is provided in the enclosure portion 13 , and the notch 132 is inserted and matched with the protrusion, which further makes the inner gasket 31 more stable.

As shown in FIGS. 7 and 8 , in the first embodiment, an avoidance concave portion 131 is provided on the enclosure portion 13 , and the avoidance concave portion 131 avoids the center position of the tibial plateau 10 . The concave portion 131 can limit the rotation of the outer washer 32 . When the outer washer 32 is excessively rotated, the protrusions on both sides of the concave portion 131 can limit the position of the outer washer 32. At the same time, due to the arrangement of the concave portion 131, the outer washer 32 can only move inside the flat portion 14. This can effectively prevent the outer spacer 32 from interfering with other structures when it is rotated out, preventing it from causing damage to the bone structure of the human body. In addition, the concave portion 131 has a simple structure and is easy to install. The concave portion 131 can also avoid the rotation hole.

As shown in FIGS. 5 and 6 , in the first embodiment, the tibial platform 10 further includes an anti-rotation wing 15, the anti-rotation wing 15 is connected with the installation platform 11 and the positioning column 12, and the contact surface between the tibial platform 10 and the lateral pad 32 is polished noodle. The anti-rotation wing 15 can prevent the tibial platform 10 from moving or rotating after it is installed, and the anti-rotation wing 15 can also play a supporting role on the installation platform 11, thereby making the fixation effect of the tibial platform 10 poor, and it is easy to make the patient's surgical effect is poor or even aggravate the patient's condition. The polished surface can effectively reduce friction and reduce the wear of the tibial plateau 10 and the lateral pad 32 . In this embodiment, there are two anti-rotation wings 15 . Of course, in other embodiments, the number of anti-rotation wings may also be three, four or more.

As shown in FIGS. 1 to 8 , during the movement of the knee prosthesis from extension to flexion, relative to the tibial plateau 10 , the medial condyle joint externally rotates (axis shifts), and the lateral condyle joint rolls back. The inner spacer 31 is a fixed spacer, and the articular surface of the inner spacer 31 and the articular surface of the medial condyle joint form a "ball socket" kinematic pair, and the medial condyle joint can be rotated externally (axis shifted) during flexion; the lateral spacer 32 is The movable gasket, the rotation column 41 is matched with the rotation hole 42, and the joint surface of the lateral gasket 32 cooperates with the joint surface of the lateral condyle joint and rotates back and forth around the rotation hole 42 during flexion to realize the backward rolling motion. One side of the medial spacer 31 is an articular surface that cooperates with the medial condyle joint, and one side is designed with a locking surface that cooperates with the inner side of the tibial platform 10; The hole 42 is fitted with the rotating column 41 . The interior of the enclosure portion 13 is a locking groove, the center of the tibial platform 10 is designed with a rotation hole for the outer spacer 32, the outer side of the enclosure portion 13 is designed as a polished movable surface, and the back of the polished movable surface is designed with a positioning column 12. and two anti-rotor 15. The material of the gasket member 30 in this embodiment is polyethylene.

As shown in FIGS. 9 to 11 , in the second embodiment, the difference from the first embodiment is that the rotation column 41 is located on the tibial plateau 10 , and the rotation hole 42 is also located on the bottom surface of the lateral pad 32 .

As shown in FIGS. 9 to 11 , in the second embodiment, the tibial platform 10 includes a mounting platform 11 and a positioning column 12 located at the bottom of the mounting platform 11 , the rotation hole 42 is located at the bottom of the lateral washer 32 , and the rotating column 41 is located on the tibial platform. Above 10 , the rotating column 41 and the positioning column 12 are coaxially arranged. The rotation center of the outer spacer 32 is the axis of the rotation column 41 . This setting method is similar to the effect of the first embodiment, both of which can make the lateral spacer 32 rotate, so that the knee joint prosthesis has more movement forms.

As shown in FIGS. 12 to 14 , the difference between the third embodiment and the first embodiment is that the third embodiment is provided with an arc-shaped sliding rail 43 and an arc-shaped sliding groove 44 , and the arc-shaped sliding rail 43 and the arc-shaped sliding groove 44 are provided with the arc-shaped sliding rail 43 and the arc-shaped sliding groove 44 . With the matching, the movement of the outer gasket 32 on the plane portion 14 can be realized.

As shown in FIGS. 12 to 14 , in the third embodiment, the moving mechanism 40 includes an arc-shaped sliding rail 43 and an arc-shaped sliding groove 44 . On the outer gasket 32 , the arc-shaped sliding rail 43 is located in the arc-shaped sliding groove 44 , and the arc-shaped sliding groove 44 can slide relative to the arc-shaped sliding rail 43 . The arc-shaped sliding groove 44 and the arc-shaped sliding rail 43 have simple structures and good cooperation effect. The arc-shaped slide rails 43 and the arc-shaped slide grooves 44 are both dovetail-shaped, which can stabilize the cooperation between the arc-shaped slide rails 43 and the arc-shaped slide grooves 44, and the arc-shaped slide rails 44 can prevent the arc-shaped slide rails 43 from disengaging, which further improves the The stability of the cooperation between the arc-shaped sliding rail 43 and the arc-shaped sliding groove 44 .

Of course, the above-mentioned arc-shaped sliding rail can also be arranged on the outer pad, and the arc-shaped sliding groove is arranged on the tibial plateau at this time, which can also realize the movement of the outer pad on the plane portion.

As shown in FIGS. 12 to 14 , in the third embodiment, the arc-shaped sliding groove 44 is arranged at the bottom of the outer gasket 32 , the arc-shaped sliding rail 43 is arranged on the upper part of the tibial plateau 10 , and at least one end of the arc-shaped sliding groove 44 is Open end 441 . The arrangement of the open end 441 enables the arc-shaped slide rail 43 to be inserted into the arc-shaped slide slot 44 through the open end 441 , which facilitates the installation of the arc-shaped slide rail 43 and the arc-shaped slide slot 44 . In this embodiment, the open end 441 is one, and the open end 441 is shown in FIGS. 13 and 14 . Of course, the number of open ends can also be set to two, and in this case, the arc-shaped chute penetrates the outer gasket.

In the related art, an enclosure portion is provided on the tibial plateau, and both the medial spacer and the lateral spacer are arranged in the enclosure portion. This setting is to prevent the lateral spacer from sliding out of the tibial plateau ball when the knee joint prosthesis is flexed. However, this design is easy to deform the lateral gasket, and the matching degree with the femoral condyle component is reduced, and at the same time, an active interface between the side of the gasket and the enclosure is added, which increases the wear of the gasket. In the technical solution of the present application, the enclosure portion of the outer gasket is eliminated, which can effectively avoid the above-mentioned disadvantages. Meanwhile, in the related art, a longitudinal ridge separating the inner and outer platforms of the tibial plateau is also provided at the upper end of the tibial plateau. However, when this setting is extremely active, the femoral condyle component will collide with the tibial plateau, forming metal-to-metal contact, and generating more metal ions, thereby affecting the surgical effect of the patient. The technical solution of the present application is to cancel the separating longitudinal ridge, and through this arrangement, the support capability of the spacer component can be improved, and at the same time, the contact between the femoral condyle component and the tibial plateau can be avoided.

In the description of the present invention, it should be understood that the orientations indicated by orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and these orientation words do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be construed as a limitation on the protection scope of the present invention; the orientation words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under other devices or constructions". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of the present invention.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A knee joint prosthesis, comprising:

a tibial plateau (10);

a femoral condylar component (20) located above the tibial plateau (10);

a shim component (30), the shim component (30) being located between the tibial plateau (10) and the femoral condylar component (20), the shim component (30) including a medial shim (31) and a lateral shim (32);

a translation mechanism (40) disposed between the tibial plateau (10) and the lateral insert (32), the lateral insert (32) being translated on the tibial plateau (10) by the translation mechanism (40).

2. Knee joint prosthesis according to claim 1, characterized in that said movement mechanism (40) comprises a rotation post (41) and a rotation hole (42), one of said rotation post (41) and said rotation hole (42) being provided on said tibial plateau (10) and the other on said lateral spacer (32), said rotation post (41) being inserted in said rotation hole (42) and being able to rotate.

3. Knee joint prosthesis according to claim 2, characterized in that the tibial plateau (10) comprises a mounting platform (11) and a positioning post (12) at the bottom of the mounting platform (11), the rotation hole (42) being located inside the positioning post (12), the rotation post (41) being located at the bottom of the lateral spacer (32).

4. Knee joint prosthesis according to claim 2, characterized in that the tibial plateau (10) comprises a mounting platform (11) and a positioning post (12) at the bottom of the mounting platform (11), the rotation hole (42) being located at the bottom of the lateral spacer (32), the rotation post (41) being located above the tibial plateau (10), the rotation post (41) being arranged coaxially with the positioning post (12).

5. The knee joint prosthesis according to claim 1, wherein the translation mechanism (40) comprises an arc-shaped sliding track (43) and an arc-shaped sliding slot (44), one of the arc-shaped sliding track (43) and the arc-shaped sliding slot (44) is arranged on the tibial plateau (10), the other one is arranged on the lateral insert (32), the arc-shaped sliding track (43) is located in the arc-shaped sliding slot (44), and the arc-shaped sliding slot (44) can slide relative to the arc-shaped sliding track (43).

6. The knee joint prosthesis according to claim 5, wherein the arc-shaped sliding groove (44) is arranged at the bottom of the lateral insert (32), the arc-shaped sliding rail (43) is arranged at the upper part of the tibial plateau (10), and at least one end of the arc-shaped sliding groove (44) is an open end (441).

7. Knee joint prosthesis according to claim 1, characterized in that the tibial plateau (10) is provided with a surrounding portion (13), in which surrounding portion (13) part of the structure of the medial insert (31) is located, the tibial plateau (10) having a flat portion (14) cooperating with the lateral insert (32), the surrounding portion (13) projecting from the flat portion (14).

8. Knee joint prosthesis according to claim 7, characterized in that the medial pad (31) comprises a base body and a raised portion at the bottom of the base body, the raised portion being located within the containment portion (13), the outer side wall of the base body being flush with the outer side wall of the containment portion (13).

9. The knee joint prosthesis according to claim 7 is characterized in that an avoiding recess (131) is provided on the surrounding portion (13), and the avoiding recess (131) avoids the central position of the tibial platform (10).

10. The knee joint prosthesis according to claim 3, characterized in that the tibial plateau (10) further comprises an anti-rotation wing (15), the anti-rotation wing (15) being connected with the mounting plateau (11) and the positioning post (12); and/or the contact surface of the tibial plateau (10) and the lateral gasket (32) is a polished surface.

Images