Knee prosthesis

Abstract

The present invention provides a knee joint prosthesis, comprising: a tibial plateau; a femoral condyle component located above the tibial plateau; a gasket component located between the tibial plateau and the femoral condyle component, the gasket component comprising an inner gasket and an outer gasket; a moving mechanism disposed between the tibial plateau and the outer gasket, the outer gasket moving on the tibial plateau through the moving mechanism. The technical solution of the present application effectively solves the problem of poor effect of knee joint prostheses in the related art.

Description

Technical Field

[0001] The present invention relates to the field of orthopedic implants, in particular to a knee joint prosthesis. Background Art

[0002] Artificial knee replacement is to use artificial material interface to replace the worn or diseased knee joint surface, with the purpose of eliminating the patient's pain, correcting joint deformity, and restoring the patient's functional activities. Knee joint movement is a complex movement process. During flexion, the femoral condyle not only slides on the tibial platform, but also rolls and rotates, which is specifically manifested as medial condyle external rotation and lateral condyle backward rolling.

[0003] In the related art, the knee joint prosthesis can achieve the sliding of the femoral condyle on the tibial platform. When the above-mentioned knee joint prosthesis is used for replacement surgery, the patient is prone to motor dysfunction. Summary of the invention

[0004] The main purpose of the present invention is to provide a knee joint prosthesis to solve the problem of poor effect of knee joint prosthesis in the related art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a knee joint prosthesis is provided, comprising: a tibial plateau; a femoral condyle component located above the tibial plateau; a gasket component located between the tibial plateau and the femoral condyle component, the gasket component comprising a medial gasket and a lateral gasket; a moving mechanism disposed between the tibial plateau and the lateral gasket, the lateral gasket moving on the tibial plateau via the moving mechanism.

[0006] Furthermore, the moving mechanism includes a rotating column and a rotating hole, one of which is arranged on the tibial platform, and the other is arranged on the outer gasket, and the rotating column is inserted into the rotating hole and can rotate.

[0007] Furthermore, 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 rotation column is located at the bottom of the outer gasket.

[0008] Furthermore, the tibial platform includes a mounting platform and a positioning column located at the bottom of the mounting platform, the rotation hole is located at the bottom of the outer gasket, the rotation column is located above the tibial platform, and the rotation column and the positioning column are coaxially arranged.

[0009] Furthermore, the moving mechanism includes an arcuate slide rail and an arcuate slide groove, one of the arcuate slide rail and the arcuate slide groove is arranged on the tibial platform, and the other is arranged on the outer gasket, the arcuate slide rail is located in the arcuate slide groove, and the arcuate slide groove can slide relative to the arcuate slide rail.

[0010] Furthermore, the arc-shaped slide groove is arranged at the bottom of the outer gasket, the arc-shaped slide rail is arranged on the upper part of the tibial plateau, and at least one end of the arc-shaped slide groove is an open end.

[0011] Furthermore, a retaining portion is provided on the tibial platform, a part of the structure of the medial gasket is located in the retaining portion, the tibial platform has a plane portion cooperating with the lateral gasket, and the retaining portion protrudes from the plane portion.

[0012] Furthermore, the inner gasket includes a base and a protruding portion located at the bottom of the base, the protruding portion is located inside the enclosure portion, and the outer side wall of the base is flush with the outer side wall of the enclosure portion.

[0013] Furthermore, an avoidance recess is provided on the enclosure portion, and the avoidance recess avoids the center position of the tibial plateau.

[0014] Furthermore, the tibial plateau further comprises an anti-rotation wing, which is connected to the mounting platform and the positioning column; and / or, the contact surface between the tibial plateau and the lateral gasket is a polished surface.

[0015] By applying the technical solution of the present invention, the femoral condyle component is installed above the tibial plateau, the gasket component includes an inner gasket and an outer gasket, the inner gasket and the outer gasket are installed between the femoral condyle component and the tibial plateau, a moving mechanism is provided between the tibial plateau and the outer gasket, and the outer gasket can be moved under the action of the moving mechanism. By providing the above-mentioned moving mechanism, when the femoral condyle component slides, rolls or rotates, the outer gasket can move accordingly, thereby making the femoral condyle component and the outer gasket cooperate with each other, so that the knee joint prosthesis can have more movement forms, so that the knee joint prosthesis can be closer to the movement form of the human knee joint, and thus the effect of the knee joint prosthesis is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. 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 drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a knee joint prosthesis according to a first embodiment of the present invention is shown;

[0018] Figure 2 Shows Figure 1 A three-dimensional structural diagram of a partial structure of a knee joint prosthesis;

[0019] Figure 3 Shows Figure 2 Schematic diagram of a top view of a knee prosthesis;

[0020] Figure 4 Shows Figure 1A schematic diagram of the three-dimensional structure of the femoral condyle component of a knee joint prosthesis;

[0021] Figure 5 Shows Figure 1 Schematic diagram of the three-dimensional structure of the tibial plateau of the knee joint prosthesis;

[0022] Figure 6 Shows Figure 1 Schematic diagram of the exploded structure of the lateral gasket of the knee prosthesis;

[0023] Figure 7 Shows Figure 1 Schematic diagram of the exploded structure of the medial spacer of the knee prosthesis;

[0024] Figure 8 Shows Figure 7 A bottom view schematic diagram of the enclosure portion of a knee joint prosthesis;

[0025] Fig. 9 It shows a three-dimensional structural schematic diagram of a second embodiment of a knee joint prosthesis according to the present invention;

[0026] Fig.10 Shows Fig. 9 A schematic diagram of the three-dimensional structure of the lateral gasket of a knee joint prosthesis;

[0027] Fig.11 Shows Fig.10 A schematic diagram of the three-dimensional structure of the outer gasket from another perspective;

[0028] Fig.12 It shows a three-dimensional structural schematic diagram of a third embodiment of a knee joint prosthesis according to the present invention;

[0029] Fig.13 Shows Fig.12 A schematic diagram of the three-dimensional structure of the lateral gasket of the knee joint prosthesis; and

[0030] Fig.14 Shows Fig.13 Schematic diagram of the bottom view of the outer gasket.

[0031] The above drawings include the following reference numerals:

[0032] 10. Tibial plateau; 11. Mounting platform; 12. Positioning column; 13. Enclosure; 131. Recess; 132. Notch; 14. Plane; 15. Anti-rotation wing; 20. Femoral condyle component; 30. Gasket component; 31. Medial gasket; 32. Outer gasket; 40. Moving mechanism; 41. Rotating column; 42. Rotating hole; 43. Arc-shaped slide rail; 44. Arc-shaped slide groove; 441. Open end. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0036] In order to make the knee joint prosthesis better simulate the kinematic morphology of the human knee joint, in the first embodiment, Figures 1 to 5 As shown, the knee joint prosthesis includes: a tibial plateau 10, a femoral condyle component 20, a spacer component 30 and a moving mechanism 40. The femoral condyle component 20 is located above the tibial plateau 10. The spacer component 30 is located between the tibial plateau 10 and the femoral condyle component 20, and the spacer component 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 spacer 32, and the lateral spacer 32 moves on the tibial plateau 10 through the moving mechanism 40.

[0037] According to the technical solution of the first embodiment, the femoral condyle component 20 is installed above the tibial plateau 10, and the gasket component 30 includes a medial gasket 31 and a lateral gasket 32. The medial gasket 31 and the lateral gasket 32 ​​are installed between the femoral condyle component 20 and the tibial plateau 10. A moving mechanism 40 is provided between the tibial plateau 10 and the lateral gasket 32, and the lateral gasket 32 ​​can move under the action of the moving mechanism 40. By providing the above-mentioned moving mechanism 40, when the femoral condyle component 20 slides, rolls or rotates, the lateral gasket 32 ​​can move accordingly, thereby making the femoral condyle component 20 and the lateral gasket 32 ​​cooperate with each other, so that the knee joint prosthesis can have more movement forms, so that the knee joint prosthesis can be closer to the movement form of the human knee joint, and thus the effect of the knee joint prosthesis is better.

[0038] The femoral condyle component includes a medial condyle joint and a lateral condyle joint, the medial condyle joint cooperates with the medial gasket, and the lateral condyle joint cooperates with the lateral gasket, and when the knee joint prosthesis is flexed, the movement characteristics of the medial condyle joint external rotation (axial shift) and the lateral condyle joint backward rolling can be realized. The knee joint prosthesis of this embodiment can improve the patient's postoperative satisfaction and extend the service life of the knee joint prosthesis.

[0039] Considering the difficulty of matching and the complexity of the structure, in the first embodiment, Figures 5 to 7 As shown, the moving mechanism 40 includes a rotating column 41 and a rotating hole 42. The rotating hole 42 is arranged on the tibial platform 10. The rotating column 41 is arranged on the outer gasket 32. The rotating column 41 is inserted into the rotating hole 42 and can rotate. The rotating hole 42 of the rotating column 41 has a simple structure and a 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, so that the femoral condyle component 20 can not only slide and roll on the gasket component 30 but also rotate, so that the knee joint prosthesis can simulate the movement of the physiological knee joint.

[0040] like Figure 1 , Figure 2 as well as Figure 5 As shown, 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 rotation column 41 is located at the bottom of the outer gasket 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 avoid interference with other structures such as ligament soft tissue, thereby deteriorating the surgical effect of the patient. The positioning column 12 is conducive to the conduction of mechanics.

[0041] like Figure 6As shown, the rotating column 41 includes a first conical mating surface located at the bottom, and the first conical mating surface facilitates the plug-in mating of the rotating column 41. Above the first conical mating surface is a rotating mating surface, which is mated with the inside of the rotating hole 42, and mainly realizes the rotating mating here. The rotating mating surface is a cylindrical surface. A second conical mating surface is arranged above the rotating mating surface. The rotating hole 42 is adapted to the shape of the rotating column 41, and the rotating hole includes a first inner conical surface, a cylindrical surface and a second inner conical surface. The first inner conical surface is mated with the first conical mating surface, the two cylindrical surfaces are mated, and the second inner conical surface is mated with the second conical mating surface. The rotation of the rotating column 41 is made more stable. The length of the rotating 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 rotating column 41, so that the rotating column 41 can be prevented from being disengaged from the rotating hole 42, so that the outer gasket 32 ​​will not be dislocated during the movement of the outer gasket 32.

[0042] like Figure 7 and Figure 8 As shown, in the first embodiment, a retaining portion 13 is provided on the tibial plateau 10, part of the structure of the medial gasket 31 is located in the retaining portion 13, and the tibial plateau 10 has a plane portion 14 that cooperates with the lateral gasket 32, and the retaining portion 13 protrudes from the plane portion 14. The setting of the retaining portion 13 can effectively limit the movement of the medial gasket 31 and prevent it from detaching from the tibial plateau 10. There is no retaining structure on the plane portion 14, and the lateral gasket 32 ​​can move on the plane portion, so that the femoral condyle component 20 can rotate.

[0043] In order to prevent the medial spacer from detaching and to make the medial spacer in closer contact with the femoral condyle component, Figure 7 and Figure 8 As shown, in the first embodiment, the medial gasket 31 includes a base and a protrusion located at the bottom of the base, the protrusion is located in the enclosure 13, and the outer wall of the base is flush with the outer wall of the enclosure 13. The protrusion can limit the medial gasket 31 in the enclosure 13, and the size of the base is the same as the size of the enclosure, so that the contact area between the medial gasket 31 and the femoral condyle component 20 can be larger, thereby making the movement of the knee joint prosthesis more stable. At the same time, a convex block is provided on the protrusion, and a notch 132 is provided in the enclosure 13. The notch 132 is plugged and matched with the protrusion, which further makes the medial gasket 31 more stable.

[0044] like Figure 7 and Figure 8As shown, in the first embodiment, an avoidance recess 131 is provided on the enclosure portion 13, and the avoidance recess 131 avoids the center position of the tibial plateau 10. The recess 131 can limit the rotation of the outer gasket 32. When the outer gasket 32 ​​rotates excessively, the protrusions on both sides of the recess 131 can limit the outer gasket 32. At the same time, due to the setting of the recess 131, the outer gasket 32 ​​can only move inside the plane portion 14, which can effectively avoid the outer gasket 32 ​​from interfering with other structures when it is rotated out, and prevent it from causing damage to the bone structure of the human body. In addition, the structure of the recess 131 is simple and easy to set. The recess 131 can also avoid the rotation hole.

[0045] like Figure 5 and Figure 6 As shown, in the first embodiment, the tibial plateau 10 also includes an anti-rotation wing 15, and the anti-rotation wing 15 is connected to the mounting platform 11 and the positioning column 12, and the contact surface between the tibial plateau 10 and the lateral gasket 32 ​​is a polished surface. The anti-rotation wing 15 can prevent the tibial plateau 10 from moving or rotating after installation, and the anti-rotation wing 15 can also support the mounting platform 11, thereby making the fixation effect of the tibial plateau 10 poor, which can easily make the patient's surgical effect 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 gasket 32. In this embodiment, there are two anti-rotation wings 15. Of course, in other embodiments, the anti-rotation wings can also be three, four or more.

[0046] like Figures 1 to 8 As shown, during the movement of the knee joint prosthesis from extension to flexion, the medial condyle joint rotates externally (axial displacement) and the lateral condyle joint rolls backward relative to the tibial plateau 10. The medial gasket 31 is a fixed gasket, and the articular surface of the medial gasket 31 and the articular surface of the medial condyle joint form a "ball-and-socket" kinematic pair, and the medial condyle joint can rotate externally (axial displacement) during flexion; the lateral gasket 32 ​​is a movable gasket, and the rotation column 41 cooperates with the rotation hole 42. During flexion, the articular surface of the lateral gasket 32 ​​cooperates with the articular surface of the lateral condyle joint and rotates back and forth around the rotation hole 42 to achieve backward rolling. One side of the medial gasket 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 plateau 10; one side of the lateral gasket 32 ​​is an articular surface that cooperates with the lateral condyle joint, and one side is designed with a rotation column 41 that cooperates with the tibial rotation hole 42. The interior of the enclosure 13 is a locking groove, the center of the tibial plateau 10 is designed with a rotation hole for the outer gasket 32, the outer side of the enclosure 13 is designed as a polished active surface, and the back of the polished active surface is designed with a positioning column 12 and two anti-rotation wings 15. The material of the gasket component 30 of this embodiment is polyethylene.

[0047] like Figures 9 to 11As shown, in the second embodiment, the difference from the first embodiment is that the rotation column 41 is located on the tibial plateau 10 , and similarly the rotation hole 42 is located on the bottom surface of the lateral gasket 32 ​​.

[0048] like Figures 9 to 11 As shown, in the second embodiment, the tibial plateau 10 includes a mounting platform 11 and a positioning column 12 located at the bottom of the mounting platform 11, a rotation hole 42 is located at the bottom of the lateral gasket 32, a rotation column 41 is located above the tibial plateau 10, and the rotation column 41 is coaxially arranged with the positioning column 12. The rotation center of the lateral gasket 32 ​​is the axis of the rotation column 41. This setting method has a similar effect to that of the first embodiment, and both can make the lateral gasket 32 ​​rotate, thereby making the knee joint prosthesis have more motion forms.

[0049] like Figure 12 to Figure 14 As shown, the difference between the third embodiment and the first embodiment is that the third embodiment is provided with an arc-shaped slide rail 43 and an arc-shaped slide groove 44 , and the outer gasket 32 ​​can be moved on the plane portion 14 through the cooperation of the arc-shaped slide rail 43 and the arc-shaped slide groove 44 .

[0050] like Figure 12 to Figure 14 As shown, in the third embodiment, the moving mechanism 40 includes an arc-shaped slide rail 43 and an arc-shaped slide groove 44. The arc-shaped slide rail 43 is arranged on the tibial platform 10, and the arc-shaped slide groove 44 is arranged on the outer gasket 32. The arc-shaped slide rail 43 is located in the arc-shaped slide groove 44, and the arc-shaped slide groove 44 can slide relative to the arc-shaped slide rail 43. The arc-shaped slide groove 44 and the arc-shaped slide rail 43 have simple structures and good matching effects. The arc-shaped slide rail 43 and the arc-shaped slide groove 44 are both dovetail-shaped, which can make the matching of the arc-shaped slide rail 43 and the arc-shaped slide groove 44 stable, and the arc-shaped slide groove 44 can prevent the arc-shaped slide rail 43 from detaching, further improving the stability of the matching of the arc-shaped slide rail 43 and the arc-shaped slide groove 44.

[0051] Of course, the arc-shaped slide rail mentioned above can also be arranged on the outer gasket, and in this case, the arc-shaped slide groove is arranged on the tibial platform, which can also realize the movement of the outer gasket on the plane part.

[0052] like Figure 12 to Figure 14 As shown, in the third embodiment, the arcuate slide groove 44 is arranged at the bottom of the outer gasket 32, the arcuate slide rail 43 is arranged on the upper part of the tibial plateau 10, and at least one end of the arcuate slide groove 44 is an open end 441. The arrangement of the open end 441 enables the arcuate slide rail 43 to be inserted into the arcuate slide groove 44 through the open end 441, which facilitates the installation of the arcuate slide rail 43 and the arcuate slide groove 44. In this embodiment, the open end 441 is one, Fig.13 and Fig.14 The open end 441 is shown in FIG. Of course, the open end can also be set to two, in which case the arc-shaped chute runs through the outer gasket.

[0053] In the related art, a retaining portion is provided on the tibial platform, and both the medial gasket and the lateral gasket are provided in the retaining portion. This setting is to prevent the lateral gasket from slipping out of the tibial platform socket and dislocating when the knee joint prosthesis is flexed. However, this design easily causes the lateral gasket to deform, and the matching degree with the femoral condyle component is reduced. At the same time, an active interface between the gasket side and the retaining portion is added, which increases the wear of the gasket. The technical solution of the present application cancels the retaining portion of the lateral gasket, which can effectively avoid the above-mentioned shortcomings. At the same time, in the related art, a longitudinal ridge is provided at the upper end of the tibial platform to separate the medial and lateral platforms of the tibial platform. However, when the setting is extremely active, the femoral condyle component and the tibial platform collide, forming metal-to-metal contact, generating more metal ions, and thus affecting the surgical effect of the patient. The technical solution of the present application cancels the separating longitudinal ridge, and the supporting capacity of the gasket component can be improved by this setting, and the contact between the femoral condyle component and the tibial platform can be avoided at the same time.

[0054] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A knee joint prosthesis, characterized in that: include: Tibial plateau (10); A femoral condyle component (20) located above the tibial platform (10); A gasket component (30), the gasket component (30) being located between the tibial plateau (10) and the femoral condyle component (20), the gasket component (30) comprising a medial gasket (31) and a lateral gasket (32); A moving mechanism (40) is disposed between the tibial platform (10) and the lateral gasket (32), and the lateral gasket (32) moves on the tibial platform (10) via the moving mechanism (40); The moving mechanism (40) comprises an arc-shaped slide rail (43) and an arc-shaped slide groove (44); one of the arc-shaped slide rail (43) and the arc-shaped slide groove (44) is arranged on the tibial platform (10), and the other is arranged on the outer gasket (32); the arc-shaped slide rail (43) is located in the arc-shaped slide groove (44), and the arc-shaped slide groove (44) can slide relative to the arc-shaped slide rail (43). The tibial platform (10) is provided with a retaining portion (13), a part of the structure of the medial gasket (31) is located in the retaining portion (13), the tibial platform (10) has a plane portion (14) cooperating with the lateral gasket (32), the retaining portion (13) protrudes from the plane portion (14), and the plane portion (14) has no retaining structure.

2. The knee joint prosthesis according to claim 1, characterized in that: The tibial platform (10) comprises a mounting platform (11) and a positioning column (12) located at the bottom of the mounting platform (11).

3. The knee joint prosthesis according to claim 1, characterized in that: The arc-shaped slide groove (44) is arranged at the bottom of the outer gasket (32), the arc-shaped slide rail (43) is arranged on the upper part of the tibial platform (10), and at least one end of the arc-shaped slide groove (44) is an open end (441).

4. The knee joint prosthesis according to claim 1, characterized in that: The inner gasket (31) comprises a base and a raised portion located at the bottom of the base, the raised portion is located inside the enclosure (13), and the outer side wall of the base is flush with the outer side wall of the enclosure (13).

5. The knee joint prosthesis according to claim 1, characterized in that: The enclosure portion (13) is provided with an avoidance recess (131), and the avoidance recess (131) avoids the central position of the tibial platform (10).

6. The knee joint prosthesis according to claim 2, characterized in that: The tibial platform (10) further comprises an anti-rotation wing (15), wherein the anti-rotation wing (15) is connected to the mounting platform (11) and the positioning column (12); and / or the contact surface between the tibial platform (10) and the outer gasket (32) is a polished surface.

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