阅读说明：本技术 一种膝关节假体 (Knee joint prosthesis ) 是由 史春宝 解凤宝 王帅 于 2020-04-28 设计创作，主要内容包括：本发明属于医用假体技术领域,公开了一种膝关节假体。该膝关节假体包括股骨假体和胫骨平台衬垫。股骨假体的与胫骨平台衬垫相配合的面形成有内髁面和外髁面,以及形成在内髁面与外髁面之间的髁间通槽和与髁间通槽相连的髁间凹槽。胫骨平台衬垫的与股骨假体相配合的面上形成有用于对应支撑内髁面和外髁面的内髁支撑面和外髁支撑面,以及形成在内髁支撑面与外髁支撑面之间的导向立柱和凸部。其中,髁间凹槽的截面构造为扇形结构,扇形结构的构造圆心角的两个侧边之间的距离自髁间通槽沿远离髁间通槽的方向逐渐增大。本发明的膝关节假体能够提高假体植入后的稳定性,同时能够减少假体植入后刺激周围的软组织而引起疼痛的概率。(The invention belongs to the technical field of medical prostheses, and discloses a knee joint prosthesis. The knee joint prosthesis includes a femoral prosthesis and a tibial plateau liner. The surface of the femoral prosthesis, which is matched with the tibial plateau liner, is provided with a medial condyle surface, a lateral condyle surface, an intercondylar through groove formed between the medial condyle surface and the lateral condyle surface and an intercondylar groove connected with the intercondylar through groove. The surface of the tibial plateau liner, which is matched with the femoral prosthesis, is provided with a medial condyle supporting surface and a lateral condyle supporting surface which are used for correspondingly supporting the medial condyle surface and the lateral condyle surface, and a guide upright post and a convex part which are formed between the medial condyle supporting surface and the lateral condyle supporting surface. The cross section of the intercondylar groove is of a fan-shaped structure, and the distance between two side edges of a structural central angle of the fan-shaped structure is gradually increased from the intercondylar through groove along the direction far away from the intercondylar through groove. The knee joint prosthesis can improve the stability of the prosthesis after being implanted and simultaneously reduce the probability of pain caused by the stimulation of surrounding soft tissues after the prosthesis is implanted.)

1. A knee joint prosthesis is characterized by comprising a femoral prosthesis and a tibial plateau liner which is in sliding fit with the femoral prosthesis,

the surface of the femoral prosthesis, which is matched with the tibial plateau liner, is provided with a medial condyle surface and a lateral condyle surface, an intercondylar through groove formed between the medial condyle surface and the lateral condyle surface, and an intercondylar groove connected with the intercondylar through groove and extending along the length direction of the intercondylar through groove,

the surface of the tibial plateau liner, which is matched with the femoral prosthesis, is provided with a medial condyle supporting surface and a lateral condyle supporting surface which are arranged on the left and the right and are used for correspondingly supporting the medial condyle surface and the lateral condyle surface, a guide upright post which is formed between the medial condyle supporting surface and the lateral condyle supporting surface and is inserted in the intercondylar through groove, and a convex part which is in sliding fit with the intercondylar groove, wherein the sliding track of the convex part relative to the intercondylar groove is constructed into the motion track of the patellar articular surface of the femoral prosthesis,

the cross section of the intercondylar groove is of a fan-shaped structure, and the distance between two side edges of a structural central angle of the fan-shaped structure is gradually increased from the intercondylar through groove along the direction far away from the intercondylar through groove.

2. Knee joint prosthesis according to claim 1, characterized in that the angle of the central angle of the sector-shaped structures ranges between 0 ° and 30 °.

3. The knee joint prosthesis of claim 1 or 2, wherein a side of the intercondylar through slot distal to the patellar articular surface is formed with a first glue reduction slot in a transverse direction.

4. The knee joint prosthesis of claim 1 or 2, wherein a second glue reduction groove is formed on a medial surface of the femoral prosthesis opposite the patellar articular surface, the second glue reduction groove being formed at a location of the femoral prosthesis at an anterior condylar end of the femoral prosthesis.

5. The knee joint prosthesis of claim 1 or 2, wherein the medial and lateral condylar surfaces are configured as a first arcuate surface, and the medial and lateral condylar bearing surfaces are configured as a second, downwardly concave arcuate surface that mates with the first arcuate surface.

6. The knee joint prosthesis of claim 1 or 2, further comprising a tibial plateau tray for supporting and securing the tibial plateau pad, the tibial plateau tray comprising: the platform support comprises a top surface, a bottom surface and a side contour surface, wherein the top surface is used for being connected with the tibial platform liner, the bottom surface is opposite to the top surface and is used for being attached to an osteotomy plane of a human tibia, and the side contour surface is used for connecting the top surface with the bottom surface; one end of the platform support connecting part is fixedly connected with the bottom surface, and the other end of the platform support connecting part is implanted into a medullary cavity of the human tibia to be connected with the human tibia; wherein the lateral contoured surface has a cross-sectional configuration that is the same as a resected plane of a human tibia.

7. The knee joint prosthesis of claim 6, wherein the side contour surface includes a medial contour adjacent the medial side of the body and a lateral contour contiguous with the medial contour and adjacent the lateral side of the body, the medial contour having a cross-sectional area greater than the cross-sectional area of the lateral contour.

8. The knee joint prosthesis of claim 6, wherein the platform support connecting portion comprises a columnar handle portion vertically and fixedly connected with the bottom surface and two plate-shaped rib structures vertically connected with the bottom surface and located on two sides of the columnar handle portion, and an included angle is formed between planes of the two plate-shaped rib structures.

9. The knee joint prosthesis of claim 8, wherein the end of the cylindrical stem portion is formed with a coupling hole, the knee joint prosthesis further comprising a plug portion detachably coupled to the coupling hole of the cylindrical stem portion.

10. The knee prosthesis of claim 9, wherein the femoral prosthesis is made of a cobalt chromium molybdenum alloy material, the tibial plateau liner and the plug portion are made of a polyethylene material, and the tibial plateau tray is made of a titanium alloy material.

Technical Field

The invention belongs to the technical field of medical prostheses, and particularly relates to a knee joint prosthesis.

Background

Knee prostheses are surgical implants used to replace the knee, which are used in a resurfacing knee replacement procedure for the knee, treating a damaged knee and replacing it with a knee prosthesis. The existing knee joint prosthesis mainly comprises: the tibial plateau support comprises a femoral prosthesis for coupling to a femur of a human body and a tibial plateau support for coupling to a tibia of a human body, and a liner positioned between the femoral prosthesis and the tibial plateau support.

Currently, knee prostheses are widely used in joint replacement surgery. However, prior art knee prostheses typically suffer from the following disadvantages: 1) the problem of pre-patellar pain of the patellar joint often occurs after implantation of a knee joint prosthesis. The occurrence reason is that the relative sliding between the femoral prosthesis and the gasket is the sliding in a single direction, and the sliding in the single direction greatly improves the abrasion speed of the matched part on one hand, thereby directly reducing the matching degree of the knee joint prosthesis; on the other hand, the degree of freedom of the knee joint after implantation of the prosthesis is also directly limited, so that the knee joint prosthesis is liable to irritate surrounding soft tissues to cause pain after the knee joint prosthesis is repeatedly subjected to tension and shear. 2) In order to meet the requirements of knee joint replacement operations of most patients, the tibial platform support is usually designed into a symmetrical structure, and the tibial platform support of the symmetrical structure cannot be completely matched with the natural contour of the tibia of the patient, so that the tibial platform support cannot completely cover the osteotomy plane of the tibia to achieve an ideal bone coverage area, and therefore, the stability of the tibial platform support after implantation can be reduced, the risk of long-term loosening of the knee joint prosthesis is increased, and in long-term use, soft tissues around the joint of the tibial platform support and the osteotomy plane can be stimulated to cause pain, and the risk of intra-articular bleeding is increased.

Disclosure of Invention

In order to solve all or part of the problems described above, an object of the present invention is to provide a knee joint prosthesis that can improve the stability of the prosthesis after implantation and reduce the probability of pain caused by irritation of surrounding soft tissues after implantation.

The knee joint prosthesis comprises a femoral prosthesis and a tibial plateau liner in sliding fit with the femoral prosthesis. The surface of the femoral prosthesis, which is matched with the tibial plateau liner, is provided with a medial condyle surface, a lateral condyle surface, an intercondylar through groove formed between the medial condyle surface and the lateral condyle surface, and an intercondylar groove which is connected with the intercondylar through groove and extends along the length direction of the intercondylar through groove. The surface of the tibial plateau pad matched with the femoral prosthesis is provided with a medial condyle supporting surface and a lateral condyle supporting surface which are arranged on the left and right and used for correspondingly supporting the medial condyle surface and the lateral condyle surface, a guide upright post which is formed between the medial condyle supporting surface and the lateral condyle supporting surface and used for being inserted in the through groove between the condyles, and a convex part which is used for being in sliding fit with the groove between the condyles, wherein the sliding track of the convex part relative to the groove between the condyles is constructed into the motion track of the patellar articular surface of the femoral prosthesis. The cross section of the intercondylar groove is of a fan-shaped structure, and the distance between two side edges of a structural central angle of the fan-shaped structure is gradually increased from the intercondylar through groove along the direction far away from the intercondylar through groove.

Further, the angle of the central angle of the fan-shaped structure ranges between 0 ° and 30 °.

Further, a first glue reducing groove in the transverse direction is formed on one side, far away from the patellar articular surface, of the intercondylar through groove.

Further, a second glue reducing groove is formed on the inner side surface of the femoral prosthesis opposite to the patellar joint surface, and the second glue reducing groove is formed at the position of the femoral prosthesis at the front condylar end of the femoral prosthesis.

Further, the medial and lateral condylar surfaces are configured as first arcuate surfaces, and the medial and lateral condylar bearing surfaces are configured as second arcuate surfaces that are downwardly concave in cooperation with the first arcuate surfaces.

Further, the knee joint prosthesis also includes a tibial plateau tray for supporting and securing the tibial plateau pad, the tibial plateau tray including: the platform support comprises a top surface, a bottom surface and a side contour surface, wherein the top surface is used for being connected with the tibial platform liner, the bottom surface is opposite to the top surface and is used for being attached to the osteotomy plane of the tibia of the human body, and the side contour surface is used for connecting the top surface with the bottom surface; one end of the platform support connecting part is fixedly connected with the bottom surface, and the other end of the platform support connecting part is implanted into a medullary cavity of the human tibia to be connected with the human tibia; wherein the cross-section of the side contoured surface is configured to be the same as the osteotomy plane of a human tibia.

Further, the side contour surface includes an inner contour adjacent to the inner side of the human body and an outer contour contiguous with the inner contour and adjacent to the outer side of the human body, the cross-sectional area of the inner contour being greater than the cross-sectional area of the outer contour.

Further, the platform holds in the palm connecting portion include with the perpendicular fixed connection's of bottom surface column stalk portion and with the perpendicular two platelike muscle structures that are connected of bottom surface and lie in the both sides of column stalk portion, the plane at two platelike muscle structures place becomes the contained angle.

Furthermore, a connecting hole is formed at the end part of the columnar handle part, and the knee joint prosthesis also comprises a plug part which is detachably connected with the connecting hole of the columnar handle part.

Further, the femoral prosthesis is made of cobalt-chromium-molybdenum alloy materials, the tibial plateau liner and the plug portion are made of polyethylene materials, and the tibial plateau support is made of titanium alloy materials.

The knee joint prosthesis of the invention has the following advantages:

1) the increase of the activity of the patellar articular surface of the knee joint prosthesis can effectively avoid the problem of the reduction of the matching degree of the knee joint prosthesis caused by the fact that the sliding in a single direction improves the abrasion speed of the matching part, thereby effectively reducing the pain caused by the stimulation of the peripheral soft tissue of the knee joint prosthesis caused by the reduction of the matching degree, namely effectively reducing the anterior patellar pain;

2) according to the knee joint prosthesis, the first glue reducing groove is formed, so that the reasonable glue reducing of the intercondylar through groove can effectively reduce the bone cutting amount under the condition that the intercondylar through groove can be connected with a femoral medullary cavity, original bone can be reserved to the maximum extent, and the phenomenon that fracture occurs around the implanted femoral prosthesis can be effectively reduced through the reserved bone;

3) the tibial plateau support of the knee joint prosthesis can enable soft tissues around the tibia to be better attached to the side contour surface, so that the problem that pain is caused by stimulation of the tibial plateau support to the soft tissues around the joint of the tibial plateau support and the osteotomy plane after the tibial plateau support is implanted is effectively solved, and the risk of bleeding in the joint can be effectively avoided;

4) the tibial plateau support of the knee joint prosthesis completely covers the osteotomy plane, so that the coverage rate of the bottom surface and the osteotomy plane is increased, the stability of the tibial plateau support after implantation can be effectively improved, and the risk of loosening of the tibial plateau support in a long term is further reduced.

Drawings

FIG. 1 is an exploded view of a knee prosthesis according to an embodiment of the present invention;

FIG. 2 is a front view of the knee prosthesis shown in FIG. 1;

FIG. 3 is a side view of the knee prosthesis shown in FIG. 1;

FIG. 4 is a schematic structural view of the femoral prosthesis shown in FIGS. 1-3;

FIG. 5 is a side cross-sectional view of the femoral prosthesis shown in FIG. 4;

FIG. 6 is a schematic view of the femoral prosthesis shown in FIG. 1 coupled to a tibial plateau liner;

fig. 7 is a bottom view of the tibial plateau tray shown in fig. 1.

Detailed Description

For a better understanding of the objects, structure and function of the invention, a knee prosthesis of the present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 to 3 show the structure of a knee joint prosthesis 100 according to an embodiment of the present invention. As shown in fig. 1 to 3, the knee joint prosthesis 100 includes a femoral prosthesis 1 and a tibial plateau liner 2 slidably fitted to the femoral prosthesis 1, and as shown in fig. 4, a medial condyle surface 11 and a lateral condyle surface 12 are formed on a surface of the femoral prosthesis 1 fitted to the tibial plateau liner 2, and an intercondylar through groove 13 formed between the medial condyle surface 11 and the lateral condyle surface 12 and an intercondylar groove 14 connected to the intercondylar through groove 13 and extending in a length direction of the intercondylar through groove 13; as shown in fig. 1, the surface of the tibial plateau pad 2 that mates with the femoral prosthesis 1 is formed with a medial condyle supporting surface 21 and a lateral condyle supporting surface 22 that are disposed on the left and right for supporting the medial condyle surface 11 and the lateral condyle surface 12 correspondingly, and a guide post 23 that is formed between the medial condyle supporting surface 21 and the lateral condyle supporting surface 22 and is inserted into the intercondylar through slot 13 and a convex portion 24 that is formed for sliding mating with the intercondylar groove 14, and a sliding track of the convex portion 24 relative to the intercondylar groove 14 is configured as a moving track of a patellar articular surface of the femoral prosthesis 1. Wherein the cross-section of the intercondylar recess 14 is configured as a fan-shaped structure (shown in conjunction with fig. 4) having a configuration in which the distance between the two sides of the central angle gradually increases from the intercondylar through slot 13 in a direction away from the intercondylar through slot 13.

When the knee joint prosthesis 100 of the embodiment of the invention is used, the femoral prosthesis 1 is fixedly connected with the medullary cavity of the femur of a human body, and the tibial plateau liner 2 is fixed on the tibial plateau support 3 of the knee joint prosthesis 100. The medial condyle surface 11 and the lateral condyle surface 12 of the femoral prosthesis 1 are placed on the corresponding medial condyle supporting surface 21 and the lateral condyle supporting surface 22, and the guide posts 23 are inserted into the intercondylar through grooves 13 to limit the sliding of the femoral prosthesis 1 relative to the tibial plateau liner 2. At this point, the projection 24 is slidably engaged within the intercondylar recess 14. When the femoral prosthesis 1 slides relative to the tibial plateau liner 2, the protrusion 24 slides relative to the intercondylar groove 14 to form a motion track of the patellar articular surface. The knee joint prosthesis 100 of the present embodiment configures the cross-section of the intercondylar recess 14 as a fan-shaped structure, while the distance between both sides of the fan-shaped structure gradually increases from the intercondylar through groove 13 in a direction away from the intercondylar through groove 13, so that the mobility of the projection 24 in the intercondylar recess 14 increases, i.e., the projection 24 is able to move in multiple sliding directions of the fan-shaped structure.

With the above arrangement, the increase in the degree of movement of the patellar articular surface of the knee joint prosthesis 100 according to the embodiment of the present invention enables the relative sliding between the femoral prosthesis 1 and the tibial plateau liner 2 to be formed into a trajectory in a plurality of directions, that is, the trajectory of movement of the patellar articular surface has a plurality of trajectories. Thus, the problem of the decrease in the degree of fitting of the knee joint prosthesis 100 due to the increase in the wear rate of the fitting portion by sliding in a single direction can be effectively avoided, so that the problem of pain caused by the stimulation of peripheral soft tissues by the knee joint prosthesis 100 due to the decrease in the degree of fitting can be effectively reduced, that is, the anterior patellar pain can be effectively reduced.

It should be noted that the cross-section of the intercondylar notch 14 should be understood as a cross-section parallel to the plane of the paper as shown in fig. 4, i.e., the area with cross-hatching as shown in fig. 4.

In a preferred embodiment, the central angle of the fan-shaped structure may range between 0 ° and 30 °. Preferably, the angle of the central angle of the fan-shaped structure may be 15 °. Through this setting, can guarantee femoral prosthesis 1 and tibial plateau liner 2 complex stability to avoid causing the emergence of femoral prosthesis 1's dislocation problem, can also guarantee effectively that the kneecap articular surface forms a plurality of movement tracks, with the activity that improves the kneecap articular surface, the problem that reduces the kneecap and ache takes place.

In a preferred embodiment shown in fig. 5, in combination with fig. 3, the intercondylar through slot 13 may be formed with a first glue reduction slot 131 in the transverse direction on the side away from the patellar articular surface. When the femur is resected to connect the femoral prosthesis 1, the femur needs to be further resected at the matching position because the intercondylar through groove 13 is formed on the femoral prosthesis 1. This embodiment is through setting up first subtracting gluey groove 131 for logical groove 13 is being guaranteed under the condition of being connected with femoral medullary cavity between the condyle to its reasonable subtracting gluey can reduce effectively and cut the bone volume, thereby can the at utmost remain original sclerotin, and then can reduce effectively through the sclerotin that remains and appear the phenomenon emergence of fracture around femoral prosthesis 1 implants back.

In a preferred embodiment shown in fig. 5, a second glue reduction groove 132 may be formed on the medial surface of the femoral prosthesis 1 opposite the patellar articular surface, and the second glue reduction groove 132 may be formed at the position of the femoral prosthesis 1 at the anterior condylar end 15 of the femoral prosthesis 1. With this arrangement, the thickness of the anterior condylar end 15 of the femoral prosthesis 1 can be thinned. Thus, the thickness-reduced anterior condyle end 15 can be better attached to the femur, and the thickness-reduced anterior condyle end 15 can better enable the bone to grow in, so that the connection between the femoral prosthesis 1 and the femur can be accelerated, and the pain time of a patient is shortened.

In a preferred embodiment shown in FIG. 6, the medial condyle surface 11 and the lateral condyle surface 12 may be configured as a first arcuate surface, and the medial condyle bearing surface 21 and the lateral condyle bearing surface 22 may be configured as a second arcuate surface that is concave downward in cooperation with the first arcuate surface. With this arrangement, the second arcuate surface can be configured as a wrap surface that mates with the first arcuate surface. Thus, the wrapping surfaces can make the fit between the medial condyle surface 11 and the lateral condyle surface 12 and the corresponding medial condyle supporting surface 21 and the lateral condyle supporting surface 22 more stable, and in addition, the sliding fit between the convex part 24 and the intercondylar groove 14 is combined, so that the knee joint prosthesis 100 of the embodiment of the invention can provide the contact sliding of the two articular surfaces, thereby not only effectively improving the stability of the knee joint prosthesis 100, but also effectively avoiding the problem of subluxation of the knee joint postoperative patient caused by unstable moderate flexion, and further avoiding unnecessary pain of the patient caused by the secondary operation.

Returning to fig. 1-3, the knee prosthesis 100 may also preferably include a tibial plateau tray 3 for supporting and securing the tibial plateau pad 2, the tibial plateau tray 3 may include: a platform-tray support 31, the platform-tray support 31 may include a top surface 311 for coupling to the tibial platform pad 2, a bottom surface 312 opposite the top surface 311 for engaging a resected bone plane of a human tibia, and a side contoured surface 313 connecting the top surface 311 and the bottom surface 312; and the platform support connecting part 32, one end of the platform support connecting part 32 is fixedly connected with the bottom surface 312, and the other end is implanted into a medullary cavity of the human tibia so as to be connected with the human tibia. Wherein the cross-section of side contoured surface 313 is configured to be the same as the osteotomy plane of a human tibia.

As shown in fig. 7, when the tibial plateau 3 according to the embodiment of the present invention is used, the plateau connecting portion 32 is implanted into the medullary cavity of the tibia, so that the tibial plateau 3 is connected to the tibia, and the bottom surface 312 of the plateau support portion 31 is attached to the osteotomy plane of the tibia, so that the bottom surface 312 covers the osteotomy plane. Tibial plateau tray 3 of embodiments of the present invention configures the cross-section of side contoured surface 313 to be the same as the osteotomy plane so that side contoured surface 313 can completely cover the osteotomy plane. Through the arrangement, on one hand, soft tissues at the periphery of the tibia can be better attached to the side contour surface 313, so that the influence of the tibial platform support 3 on peripheral soft tissues and other tissues can be effectively reduced, the problem that the tibial platform support 3 stimulates the peripheral soft tissues at the joint of the tibial platform support and the osteotomy plane to cause pain after being implanted is effectively solved, and the risk of intra-articular bleeding can be effectively avoided; on the other hand, the coverage rate of the bottom surface 312 and the osteotomy plane is increased by completely covering the osteotomy plane, so that better fusion of bone tissues and the tibial plateau tray 3 can be facilitated, the stability of the tibial plateau tray 3 after implantation can be effectively improved, and the risk of loosening the tibial plateau tray 3 in a long term is further reduced; in addition, a tibial plateau tray 3 that completely covers the osteotomy plane may also enable the patient to better adapt the tibial plateau tray 3 after implantation to enhance the kinematic characteristics of the knee joint.

Preferably, the side contour surface 313 may be formed by smoothly transitionally connecting arc-shaped curved surfaces with different curvatures.

In a preferred embodiment shown in fig. 7, the side contour surface 313 may include an inner contour 301 adjacent to the inner side of the human body and an outer contour 302 connected to the inner contour 301 and adjacent to the outer side of the human body, the cross-sectional area of the inner contour 301 being larger than the cross-sectional area of the outer contour 302. It should be noted here that the inner contour 301 near the inner side of the human body and the outer contour 302 near the outer side of the human body can be understood as: the lateral contour of the lateral condyle on the left and right sides of the centerline C for overlying the osteotomy plane of the tibia and the medial contour of the medial condyle for overlying the osteotomy plane of the tibia are shown in FIG. 7. The side contour surface 313 configured by the inner contour 301 and the outer contour 302 is formed as an asymmetric cross section. The centerline C here can be defined as: a line connecting the center point of the osteotomy plane of the tibia and parallel to the anteroposterior direction of the human body, when the tibial plateau tray 3 is connected to the osteotomy plane of the tibia, viewed along a plane perpendicular to the anatomy of the tibia (i.e., the superior viewing direction of the tibia); or a line parallel to the anterior-posterior direction of the human body defined as the medial and lateral condyles of the osteotomy plane of the tibia separating the osteotomy plane of the tibia.

Through the arrangement, on one hand, the side contour surface 313 is formed into an asymmetric cross section which can conform to the physiological shape of the osteotomy plane of the tibia, so that the side contour surface can be more widely adapted to the osteotomy plane of the tibia of most patients, and the coverage area of the tibial plateau tray 3 on the tibial osteotomy plane of most patients can be further improved; on the other hand, the asymmetric side contour surface 313 can also play a role of space orientation, that is, when the tibial plateau tray is implanted, the position of the tibial plateau tray 3 relative to the osteotomy plane can be rapidly adjusted through the asymmetric side contour surface 313, so that the tibial plateau tray can completely cover the osteotomy plane of the tibia, the stability of fixation of the tibial plateau tray is improved, and meanwhile, the operation efficiency can also be improved.

Preferably, as shown in fig. 1 to 3 and fig. 7, the platform support connecting portion 32 may include a column-shaped handle portion 321 vertically and fixedly connected to the bottom surface 312, and two plate-shaped rib structures 322 vertically connected to the bottom surface 312 and located at two sides of the column-shaped handle portion 321, and a plane in which the two plate-shaped rib structures 322 are located forms an included angle. Through this setting, after tibial plateau holds in the palm 3 and is connected with the shin bone, two platelike muscle structures 322 that become the contained angle setting can make platform support supporting part 31 receive the ascending shear stress of a plurality of directions to make the platform hold in the palm the atress in each direction of supporting part 31 more balanced, thereby can effectually reduce the risk of tibial plateau holds in the palm 3 for the fine motion of shin bone. Preferably, the angle between the planes of the two plate-like rib structures 322 may range from 90 ° to 170 °.

In the preferred embodiment shown in fig. 1 to 3, the end of the cylindrical stem 321 may be formed with a coupling hole (not shown), and the knee joint prosthesis 100 may further include a plug portion 4 detachably coupled to the coupling hole of the cylindrical stem 321. With this arrangement, when the knee joint prosthesis 100 according to the embodiment of the present invention requires installation of the extension broach, the plug portion 4 may be removed to connect the extension broach with the connection hole for use. When the knee joint prosthesis 100 does not need to be provided with the extension broach, the plug part 4 can be fixedly connected with the connecting hole. In this way, the knee prosthesis 100 of embodiments of the present invention may be adapted for use under more clinical requirements. Preferably, the plug portion 4 can be connected with the connecting hole by screw threads or by tight fit.

In a preferred embodiment, the femoral prosthesis 1 may be made of a cobalt chromium molybdenum alloy material, the tibial plateau liner 2 and the plug portion 4 may be made of a polyethylene material, and the tibial plateau tray 3 may be made of a titanium alloy material. Wherein, thighbone prosthesis 1, tibial plateau liner 2 and tibial plateau hold in the palm 3 all can the customization processing to make thighbone prosthesis 1, tibial plateau liner 2 and tibial plateau hold in the palm 3 and can form a plurality of model specifications that the product interval size is little, with the demand that satisfies different clinical patients to the at utmost.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

In the description of the present application, it is to be understood that the terms "center," "lateral," "length," "width," "left," "right," "top," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.