Tibial prosthesis and knee prosthesis

Abstract

The present invention provides a tibial prosthesis and a knee joint prosthesis, the tibial prosthesis comprising a tibial plateau, a first tibial pad and a second tibial pad, the proximal surface of the tibial plateau having a mounting surface arranged along a first axis direction; the first tibial pad being rotatably arranged on the mounting surface around the first axis, the first tibial pad having a first concave surface centered on the first axis, the first concave surface being recessed toward a distal end; the second tibial pad being arranged on the tibial plateau, the second tibial pad having a second concave surface, the second concave surface extending along an arc trajectory line parallel to the mounting surface, the center of the arc trajectory line being located on the first axis, the second concave surface being recessed toward a distal end; the first tibial pad and the second tibial pad being arranged independently of each other, and the first tibial pad being located on the inner side of the second tibial pad.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a tibial prosthesis and a knee joint prosthesis. Background Art

[0002] In the existing active platform type knee prosthesis, the tibial pad is usually installed at the central concave hole of the tibial plateau through the extension shaft at the bottom to achieve radial constraint, while providing rotational freedom, so as to realize the function of the tibial pad rotating around the center. However, the rotation achieved by such a design is quite different from the natural inner axis type movement of the knee joint. The inner axis type movement refers to the movement trajectory of the lateral condyle rotating around the axis along the outer articular surface of the tibial pad, with the ball-and-socket joint center formed by the medial condyle and the medial articular surface of the tibial pad as the axis, when the knee joint switches between the two states of extension and flexion. In this regard, the medial rotation axis active platform obtained by improvement on the basis of the traditional active platform, through the inward offset of the tibial pad rotation axis, generates an inner axis movement between the tibial pad and the tibial plateau, thereby increasing the internal and external rotation range of the inner axis movement. Since the human knee joint mechanics tends to the inner side of the articular surface, the rotation axis offset inward is conducive to the bearing of the human body's own pressure and the joint shear force during movement, and improves the stability of the prosthesis to a certain extent. However, due to the inward deviation of the rotation axis, the lateral part of the tibial pad swings with a larger amplitude and faster speed, and the rotation axis has insufficient restraint on it, which can easily cause the pad and the platform to dislocate, thereby reducing the stability of the prosthesis from another angle.

[0003] In addition, there are also fixed-platform medial-axis knee prostheses, which generally achieve the medial-axis motion function of the knee prosthesis through surface constraints on the medial articular surface of the tibial liner and relative rotation of the lateral articular surface. However, this method often causes a large relative displacement between the tibial liner and the femoral condyle, thereby increasing the risk of surface wear between the knee prosthesis and the femoral condyle and increasing the revision rate. Summary of the invention

[0004] The purpose of the present invention is to provide a tibial prosthesis and a knee joint prosthesis to solve the problem that the surface of the existing knee joint prosthesis is easy to wear.

[0005] In order to solve the above technical problems, the present invention provides a tibial prosthesis, which comprises:

[0006] A tibial plateau, wherein the proximal surface of the tibial plateau has a mounting surface arranged along the first axis direction;

[0007] a first tibial liner, the first tibial liner being rotatably disposed on the mounting surface around the first axis, the angle between the normal of the mounting surface and the first axis being in the range of 0° to 5°, the first tibial liner having a first concave surface centered on the first axis, the first concave surface being concave toward the distal end; and

[0008] A second tibial pad, the second tibial pad is arranged on the tibial platform, the second tibial pad has a second concave surface, the second concave surface extends along an arc trajectory line parallel to the mounting surface, the center of the arc trajectory line is located on the first axis, and the second concave surface is concave toward the distal end;

[0009] The first tibial pad and the second tibial pad are arranged independently of each other, and the first tibial pad is located on the inner side of the second tibial pad.

[0010] Optionally, the second tibial pad is detachably connected to the tibial plateau.

[0011] Optionally, one of the distal surface of the second tibial pad and the proximal surface of the tibial plateau is provided with a slot, and the other is provided with a convex tooth matching the slot, and the second tibial pad and the tibial plateau are assembled and connected by engaging the slot and the convex tooth in a direction perpendicular to the first axis.

[0012] Optionally, the slot is a conical slot or a rectangular slot.

[0013] Optionally, the tibial platform is provided with a mounting hole in the area of ​​the mounting surface and one of the distal surfaces of the first tibial pad, and the other is provided with a mounting column matching the mounting hole; the axis of the mounting column coincides with the axis of the mounting hole on the first axis, and the mounting column is rotatably inserted into the mounting hole around the first axis.

[0014] Optionally, the mounting column and the mounting hole are both cylindrical.

[0015] Optionally, the tibial plateau includes a column, the axis of the column is parallel to the first axis, and the column is arranged on the distal side of the tibial plateau.

[0016] Optionally, the first concave surface is a spherical surface, and the center of the spherical surface is located on the first axis.

[0017] Optionally, the first tibial pad has a circular cross-section.

[0018] In order to solve the above technical problems, the present invention also provides a knee joint prosthesis, which includes a femoral condyle prosthesis and a tibial prosthesis as described above, the femoral condyle prosthesis includes a medial condyle and a lateral condyle, the first tibial pad corresponds to the medial condyle, and the second tibial pad corresponds to the lateral condyle, when the femoral condyle prosthesis and the tibial prosthesis perform relative flexion movement, while the medial condyle and the first tibial pad rotate relative to each other, the first tibial pad rotates relative to the tibial plateau; while the lateral condyle rolls on the second tibial pad, the second tibial pad and the tibial plateau remain relatively stationary.

[0019] In summary, in the tibial prosthesis and knee joint prosthesis provided by the present invention, the tibial prosthesis includes a tibial plateau, a first tibial pad and a second tibial pad, the proximal surface of the tibial plateau has a mounting surface; the first tibial pad is rotatably arranged on the mounting surface around a first axis, the angle between the normal of the mounting surface and the first axis is in the range of 0° to 5°, the first tibial pad has a first concave surface centered on the first axis, and the first concave surface is recessed toward the distal end; the second tibial pad is arranged on the tibial plateau, the second tibial pad has a second concave surface, the second concave surface extends along an arc trajectory line parallel to the mounting surface, the center of the arc trajectory line is located on the first axis, and the second concave surface is recessed toward the distal end; the first tibial pad and the second tibial pad are arranged independently of each other, and the first tibial pad is located on the inner side of the second tibial pad. In this configuration, two independent tibial pads are provided corresponding to the medial and lateral condyles, wherein the first tibial pad corresponds to the medial condyle, and the second tibial pad corresponds to the lateral condyle. The first tibial pad is relatively rotatable with respect to the tibial plateau, while the second tibial pad remains relatively stationary with respect to the tibial plateau, thereby ensuring the relative stability of the lateral condyle. In this way, when the medial axis rotation movement is performed between the femoral condyle and the tibial prosthesis, the dual axial rotation of the medial condyle (relative rotation between the medial condyle and the first tibial pad, and relative rotation between the first tibial pad and the tibial plateau) can be achieved, thereby reducing the risk of wear of the tibial prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0021] Figure 1 is an overall schematic diagram of a tibial prosthesis provided by an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a tibial plateau provided by an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a first tibial liner provided by an embodiment of the present invention;

[0024] Figure 4 is an exploded view of a tibial prosthesis provided by an embodiment of the present invention;

[0025] Figure 5 is a top view of a tibial prosthesis provided by an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a second tibial pad provided by an embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of an axial cross section of a tibial prosthesis provided by an embodiment of the present invention;

[0028] FIG8 is a schematic diagram of a card slot provided in an embodiment of the present invention;

[0029] FIG. 9 is a schematic diagram of a mounting hole and a mounting column provided in an embodiment of the present invention.

[0030] In the attached figure:

[0031] 1-tibial plateau; 1a-mounting surface; 1b-post; 1a1-slot; 1a2-mounting hole;

[0032] 2-first tibial pad; 2a-first concave surface; 2b-mounting column; 2bc-first axis;

[0033] 3-second tibial pad; 3a-second concave surface; 3ac-center of arc trajectory line; 3at-arc trajectory line; 3b-convex tooth. DETAILED DESCRIPTION

[0034] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0035] As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly indicates otherwise. As used in this specification and the appended claims, the term "or" is generally used in a sense including "and / or", unless the content clearly indicates otherwise, the term "inside" generally refers to the side close to the median sagittal plane of the human body, and the term "outside" generally refers to the side away from the median sagittal plane of the human body. "Left" and "right" refer to the left and right sides of the human body when the prosthesis is placed in the orientation of implantation in the human body. "Proximal" refers to the end close to the human heart, and "distal" refers to the end away from the human heart.

[0036] The core idea of ​​the present invention is to provide a tibial prosthesis and a knee joint prosthesis, wherein the tibial prosthesis includes a tibial plateau, a first tibial pad and a second tibial pad, the proximal surface of the tibial plateau has a mounting surface; the first tibial pad is rotatably arranged on the mounting surface around a first axis, the angle between the normal of the mounting surface and the first axis is in the range of 0° to 5°, the first tibial pad has a first concave surface centered on the first axis, and the first concave surface is recessed toward the distal end; the second tibial pad is arranged on the tibial plateau, the second tibial pad has a second concave surface, the second concave surface extends along an arc trajectory line parallel to the mounting surface, the center of the arc trajectory line is located on the first axis, and the second concave surface is recessed toward the distal end; the first tibial pad and the second tibial pad are arranged independently of each other, and the first tibial pad is located on the inner side of the second tibial pad. In this configuration, two independent tibial pads are provided corresponding to the medial and lateral condyles, wherein the first tibial pad corresponds to the medial condyle, and the second tibial pad corresponds to the lateral condyle. The first tibial pad is relatively rotatable with respect to the tibial plateau, and the second tibial pad ensures the relative stability of the lateral condyle. In this way, when the medial axis rotation movement is performed between the femoral condyle and the tibial prosthesis, the dual axial rotation of the medial condyle (relative rotation between the medial condyle and the first tibial pad, and relative rotation between the first tibial pad and the tibial plateau) can be achieved, thereby reducing the risk of wear of the tibial prosthesis.

[0037] The following description is given with reference to the accompanying drawings.

[0038] Please refer to Figure 1 To Figure 9, where Figure 1 is an overall schematic diagram of a tibial prosthesis provided by an embodiment of the present invention, Figure 2 is a schematic diagram of a tibial plateau provided by an embodiment of the present invention, Figure 3 is a schematic diagram of a first tibial liner provided by an embodiment of the present invention, Figure 4 is an exploded view of a tibial prosthesis provided by an embodiment of the present invention, Figure 5 is a top view of a tibial prosthesis provided by an embodiment of the present invention, Figure 6 is a schematic diagram of a second tibial pad provided by an embodiment of the present invention, Figure 7 FIG. 8 is a schematic diagram of an axial cross section of a tibial prosthesis provided in an embodiment of the present invention. FIG. 9 is a schematic diagram of a mounting hole and a mounting column provided in an embodiment of the present invention.

[0039] like Figure 1 , Figure 4 and Figure 5As shown, an embodiment of the present invention provides a tibial prosthesis, which includes: a tibial plateau 1, a first tibial pad 2 and a second tibial pad 3. The proximal surface of the tibial plateau 1 has a mounting surface 1a arranged along the first axis direction, that is, the mounting surface 1a faces the human femur (upward in the figure); the first tibial pad 2 is rotatably arranged on the mounting surface 1a around a first axis 2bc, and the first axis 2bc is located at the position of the tibial plateau 1 corresponding to the medial condyle, and is the rotation axis of the prosthesis for the inner axis movement. It should be noted that the first axis 2bc is roughly perpendicular to the mounting surface 1a, that is, the angle between the normal of the mounting surface 1a and the first axis 2bc is in the range of 0° to 5°. Preferably, the first axis 2bc is perpendicular to the mounting surface 1a. The first tibial pad 2 has a first concave surface 2a centered on the first axis 2bc, and the first concave surface 2a is recessed toward the distal end. Preferably, the first concave surface 2a is a spherical surface (ball-and-socket joint surface), and the center of the spherical surface is located on the first axis 2bc; the second tibial pad 3 is arranged on the tibial platform 1, and the second tibial pad 3 has a second concave surface 3a, and the second concave surface 3a extends along an arc trajectory line 3at parallel to the mounting surface 1a, and the center 3ac of the arc trajectory line 3at is located on the first axis 2bc, and the second concave surface 3a is recessed toward the distal end.

[0040] The first tibial pad 2 and the second tibial pad 3 are arranged independently in the left-right direction, and the first tibial pad 2 is relatively located on the inner side of the second tibial pad 3. By setting two independent tibial pads for the inner and outer condyles (i.e., the first tibial pad 2 and the second tibial pad 3), wherein the first tibial pad 2 corresponds to the inner condyle and the second tibial pad 3 corresponds to the outer condyle, the first tibial pad 2 and the tibial plateau 1 are relatively rotatable, thereby increasing the degree of freedom of the knee joint and improving the matching degree between the tibia and the tibial prosthesis when the inner axis moves. The second tibial pad 3 remains relatively still with the tibial plateau, thereby ensuring the relative stability of the outer condyle and the safety of the tibial prosthesis. In actual use, the first concave surface 2a of the first tibial pad 2 cooperates with the medial condyle of the femoral condyle, so that the medial condyle rotates relative to the first tibial pad 2 around the first axis 2bc, and the first tibial pad 2 can rotate relative to the tibial plateau 1 around the first axis 2bc, and the rotation of the medial condyle is realized through double rotation; the second concave surface 3a of the second tibial pad 3 cooperates with the lateral condyle of the femoral condyle, so that the lateral condyle can roll along the arc track line 3at of the second tibial pad 3 at different knee flexion angles. Since the center 3ac of the arc track line 3at is also located on the first axis 2bc, that is, the rotation centers of the medial condyle and the lateral condyle overlap, and are both located in the load-bearing area on the inner side of the knee joint, the inner axis movement is more in line with the characteristics of the natural knee joint movement of the human body, which is conducive to improving the stability of the tibial prosthesis. When the medial axis rotation movement is performed between the femoral condyle and the tibial prosthesis, the double axial rotation of the medial condyle can be achieved (relative rotation between the medial condyle and the first tibial pad 2, and relative rotation between the first tibial pad 2 and the tibial plateau 1). Since the friction between the medial condyle and the tibial pad is decomposed into two rotational degrees of freedom of the medial condyle relative to the first tibial pad 2, and the first tibial pad 2 relative to the tibial plateau 1, the risk of wear of the tibial prosthesis is reduced.

[0041] Understandably, Figure 1 The tibial prosthesis shown actually corresponds to the right knee joint of a person, while the tibial prosthesis corresponding to the left knee joint is Figure 1 The tibial prosthesis is a mirror image of the tibial prosthesis. In addition, the tibial prosthesis is available in a variety of sizes to suit the needs of different patients. Figure 2 The tibial plateau 1 comprises a column 1b, the axis of which is parallel to the first axis 2bc, and the column is arranged at the distal side of the tibial plateau, and the column 1b extends distally from the distal side of the mounting surface 1a. In practice, the column 1b is used to be implanted in the patient's tibia and fixedly connected to the tibia, and is preferably a cylinder, and the distal end of the column 1b can be a smooth ball head shape to facilitate surgical implantation into the tibia.

[0042] Preferably, the second tibial pad 3 is detachably connected to the tibial plateau 1, so that doctors can select tibial pads of appropriate specifications to match and install with the tibial plateau according to the anatomical structure and size of different patients. Optionally, one of the distal end surface of the second tibial pad 3 and the proximal end surface of the tibial plateau 1 is provided with a slot 1a1, and the other is provided with a convex tooth 3b matching the slot 1a1. The second tibial pad 3 and the tibial plateau 1 are assembled and connected by the engagement of the slot 1a1 and the convex tooth 3b in a direction perpendicular to the first axis. Figure 2 , Figure 7 As shown in FIG8 , in an exemplary embodiment, the proximal surface of the tibial plateau 1 is provided with a slot 1a1 (mainly provided around the mounting surface 1a and close to the outer area of ​​the tibial plateau 1), and the distal surface of the second tibial pad 3 is provided with a convex tooth 3b. The second tibial pad 3 and the tibial plateau 1 can be reliably fixedly connected (locked) by the engagement of the slot 1a1 and the convex tooth 3b, and there is no axial and circumferential degree of freedom between the two, so that the stability of the second tibial pad 3 can be well guaranteed. Preferably, the slot 1a1 and the convex tooth 3b are assembled along a direction perpendicular to the first axis 2bc, that is, the second tibial pad 3 is inserted and assembled along the radial direction of the tibial plateau 1. Please refer to FIG8 , optionally, the slot can have several forms, Figure 8a The cross-sectional view when the card slot is a tapered slot is shown. Figure 8b The cross-sectional view when the slot is a rectangular slot is shown. Of course, the slot can also be in other forms, such as a semicircular slot. Correspondingly, the protruding teeth 3b match the shape of the slot 1a1, and the two can be tightly engaged. It can be understood that in some other embodiments, the bottom of the second tibial pad 3 is provided with a slot 1a1, and the tibial plateau 1 is provided with a protruding tooth 3b, which can also achieve the engagement connection between the second tibial pad 3 and the tibial plateau 1. In some other embodiments, the second tibial pad 3 can also be detachably connected to the tibial plateau 1 by other means, such as by a buckle or a pin, etc., and the present invention is not limited to this.

[0043] Furthermore, the tibial plateau 1 is provided with a mounting hole 1a2 in one of the region of the mounting surface 1a and the distal surface of the first tibial pad 2, and the other is provided with a mounting column 2b matching the mounting hole 1a2; the axis of the mounting column 2b coincides with the axis of the mounting hole 1a2 at the first axis 2bc, and the mounting column 2b is rotatably inserted into the mounting hole 1a2 around the first axis 2bc. Please refer to Figures 2 to 4 , and combined with Figure 7In an exemplary embodiment, the tibial plateau 1 is provided with a mounting hole 1a2 in the region of the mounting surface 1a, and correspondingly, the bottom (i.e., the distal surface) of the first tibial pad 2 is provided with a mounting column 2b, the outer contour dimension of the mounting column 2b is slightly smaller than the inner dimension of the mounting hole 1a2, so that the mounting column 2b can be inserted into the mounting hole 1a2 and can rotate. The axis of the mounting column 2b coincides with the first axis 2bc. With such a configuration, the first tibial pad 2 can rotate relative to the tibial plateau 1 with the first axis 2bc as the center, and the first concave surface 2a can be kept in concentric rotation relative to the first axis 2bc rather than eccentric rotation. FIG. 9 illustrates various forms of the mounting column 2b and the mounting hole 1a2, wherein: Figure 9a The cylindrical mounting column 2b and the mounting hole 1a2 are shown. Figure 9b The hemispherical mounting column 2b and the mounting hole 1a2 are shown. Fig.9c The concave-convex mounting column 2b and the mounting hole 1a2 are shown. Figure 9d The mounting column 2b and the mounting hole 1a2 of the frustum are shown. The above multiple forms can meet the assembly requirements of the mounting column 2b and the mounting hole 1a2, so that the mounting hole 1a2 can limit the radial and axial degrees of freedom of the mounting column 2b, while retaining the circumferential degree of freedom between the two. It should be noted that the forms of the mounting column 2b and the mounting hole 1a2 shown in FIG9 are only some schematic diagrams. The forms of the mounting column 2b and the mounting hole 1a2 are not limited to those shown in FIG9, and they can also be other forms, such as dovetail (Σ shape) or cone shape. It can be understood that in some other embodiments, the bottom of the first tibial pad 2 is provided with a mounting hole 1a2, and correspondingly, the tibial plateau 1 is provided with a mounting column 2b in the area of ​​the mounting surface 1a, which can also realize the rotational connection of the first tibial pad 2 relative to the tibial plateau 1. Preferably, the mounting column 2b and the mounting hole 1a2 are both cylindrical, which is easy to install and has a simple structure. Optionally, the cross-section of the first tibial pad 2 is circular, so that when the first tibial pad 2 rotates relative to the tibial plateau 1, it avoids collision with the second tibial pad 3.

[0044] Furthermore, the present invention also provides a knee joint prosthesis, which includes a femoral condyle prosthesis and a tibial prosthesis as described above, wherein the femoral condyle prosthesis includes a medial condyle and a lateral condyle, the first tibial pad corresponds to the medial condyle, and the second tibial pad corresponds to the lateral condyle, and when the femoral condyle prosthesis and the tibial prosthesis are in relative flexion motion, the medial condyle and the first tibial pad rotate relative to each other while the first tibial pad rotates relative to the tibial plateau; while the lateral condyle rolls on the second tibial pad, the second tibial pad and the tibial plateau remain relatively stationary. Since the knee joint prosthesis includes the tibial prosthesis as described above, it also has the beneficial effects brought by the above-mentioned tibial prosthesis, and those skilled in the art can appropriately configure the femoral condyle prosthesis in the knee joint prosthesis according to the prior art, which will not be described in detail here.

[0045] In summary, in the tibial prosthesis and knee joint prosthesis provided by the present invention, the tibial prosthesis includes a tibial plateau, a first tibial pad and a second tibial pad, the proximal surface of the tibial plateau has a mounting surface; the first tibial pad is rotatably arranged on the mounting surface around a first axis, the angle between the normal of the mounting surface and the first axis is in the range of 0° to 5°, the first tibial pad has a first concave surface centered on the first axis, and the first concave surface is recessed toward the distal end; the second tibial pad is arranged on the tibial plateau, the second tibial pad has a second concave surface, the second concave surface extends along an arc trajectory line parallel to the mounting surface, the center of the arc trajectory line is located on the first axis, and the second concave surface is recessed toward the distal end; the first tibial pad and the second tibial pad are arranged independently of each other, and the first tibial pad is located on the inner side of the second tibial pad. In this configuration, two independent tibial pads are provided corresponding to the medial and lateral condyles, wherein the first tibial pad corresponds to the medial condyle, and the second tibial pad corresponds to the lateral condyle. The first tibial pad is relatively rotatable with respect to the tibial plateau, while the second tibial pad remains relatively stationary with respect to the tibial plateau, thereby ensuring the relative stability of the lateral condyle. In this way, when the medial axis rotation movement is performed between the femoral condyle and the tibial prosthesis, the dual axial rotation of the medial condyle (relative rotation between the medial condyle and the first tibial pad, and relative rotation between the first tibial pad and the tibial plateau) can be achieved, thereby reducing the risk of wear of the tibial prosthesis.

[0046] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A tibial prosthesis, It is characterized in that include: A tibial plateau, the proximal surface of the tibial plateau having a mounting surface; the first tibial pad, corresponding to the medial condyle; The first tibial pad is rotatably arranged on the mounting surface around a first axis, the angle between the normal of the mounting surface and the first axis is in the range of 0° to 5°, the first tibial pad has a first concave surface centered on the first axis, and the first concave surface is recessed toward the distal end; the first concave surface is a spherical surface, and the center of the spherical surface is located on the first axis; the cross-section of the first tibial pad is circular; one of the mounting surface of the tibial platform and the distal end surface of the first tibial pad is provided with a mounting hole, and the other is provided with the mounting column matching the mounting hole, and the first tibial pad is rotatably mounted on the tibial platform through the mounting column and the mounting hole; as well as A second tibial pad, corresponding to the lateral condyle; the second tibial pad is arranged on the tibial platform, the second tibial pad has a second concave surface, the second concave surface extends along an arc trajectory line parallel to the mounting surface, the center of the arc trajectory line is located on the first axis, and the second concave surface is recessed toward the distal end; one of the distal end surface of the second tibial pad and the proximal end surface of the tibial platform is provided with a groove, and the other is provided with a convex tooth matching the groove, and the second tibial pad is fixedly mounted on the tibial platform through the convex tooth and the groove; The first tibial pad and the second tibial pad are arranged independently of each other, and the first tibial pad is located on the inner side of the second tibial pad.

2. The tibial prosthesis according to claim 1, It is characterized in that The second tibial pad is detachably connected to the tibial plateau.

3. The tibial prosthesis according to claim 2, It is characterized in that The second tibial pad is assembled and connected with the tibial platform by the engagement of the slot with the convex teeth along a direction perpendicular to the first axis.

4. The tibial prosthesis according to claim 3, It is characterized in that The clamping groove is a tapered groove or a rectangular groove.

5. The tibial prosthesis according to claim 1, It is characterized in that The axis of the mounting post and the axis of the mounting hole coincide with the first axis, and the mounting post is rotatably inserted into the mounting hole around the first axis.

6. The tibial prosthesis according to claim 5, It is characterized in that The mounting column and the mounting hole are both cylindrical.

7. The tibial prosthesis according to claim 1, It is characterized in that The tibial plateau comprises a column, the axis of the column is parallel to the first axis, and the column is arranged at the distal end side of the tibial plateau.

8. A knee joint prosthesis, It is characterized in that The invention comprises a femoral condyle prosthesis and a tibial prosthesis according to any one of claims 1 to 7, wherein the femoral condyle prosthesis comprises a medial condyle and a lateral condyle, and when the femoral condyle prosthesis and the tibial prosthesis are in relative flexion motion, the medial condyle and the first tibial pad rotate relative to each other, and the first tibial pad rotates relative to the tibial plateau; The second tibial pad and the tibial plateau remain relatively stationary while the lateral condyle rolls on the second tibial pad.

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