Joint prosthesis

Abstract

The present invention discloses a joint prosthesis, which comprises a first structure and a second structure. The first structure and the second structure are in direct contact and can perform reciprocating frictional motion. At least one of the surfaces in direct contact between the first structure and the second structure is a surface with a texture, and in at least one surface with a texture, the area ratio of the texture is between 10% and 20%. This can effectively improve the friction performance between the surfaces in direct contact in the joint prosthesis, that is, it can reduce the friction coefficient between the first structure and the second structure in reciprocating frictional motion, reduce the wear between the surfaces in direct contact, and thus extend the service life of the joint prosthesis.

Description

Technical Field

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

[0002] Nowadays, joint injuries or pain are becoming more and more serious during people's various sports, especially the knee joints. Once the joints are injured or sick, the joint movement function will be affected. With the development of medicine, the demand for joint prostheses is increasing, and the service life of joint prostheses is a problem that doctors and patients are very concerned about.

[0003] Since joint prostheses need to replace the functions of joints, they have contact structures that can perform reciprocating frictional motions. As the use time increases, the large amount of friction between the contact surfaces in the contact structures will cause wear and tear, thus reducing the service life of the joint prosthesis. Therefore, it is necessary to provide an improved joint prosthesis that reduces the friction coefficient of the contact surfaces in the joint prosthesis to extend the service life of the joint prosthesis. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a joint prosthesis to extend the service life of the joint prosthesis.

[0005] In order to solve the above technical problems, the joint prosthesis provided by the present invention includes: a first structure and a second structure, the first structure and the second structure are in direct contact and can move reciprocatingly with friction, at least one of the surfaces in direct contact between the first structure and the second structure is a textured surface, and in at least one of the textured surfaces, the area ratio of the texture is between 10% and 20%.

[0006] Furthermore, the joint prosthesis also includes a third structure, which is in direct contact with the second structure and can move reciprocatingly with friction. At least one of the surfaces in direct contact with the third structure and the second structure is a textured surface, and in at least one of the textured surfaces, the area ratio of the texture is between 10% and 20%.

[0007] Preferably, in the joint prosthesis, the texture has a morphology of pits or protrusions.

[0008] Furthermore, in the joint prosthesis, the texture is elliptical pits distributed in an array, and the direction of the long diameter of the ellipse is parallel to the movement direction of the reciprocating friction motion.

[0009] Furthermore, in the joint prosthesis, the ratio of the area occupied by the elliptical pit to the total area of ​​the textured surface is between 15% and 20%.

[0010] Furthermore, in the joint prosthesis, the depth of the elliptical pit is between 5 μm and 15 μm.

[0011] Furthermore, in the joint prosthesis, the depth of the elliptical pit is between 8 μm and 15 μm.

[0012] Furthermore, in the joint prosthesis, the aspect ratio of the elliptical pit is between 2 and 8.

[0013] Furthermore, in the joint prosthesis, the ratio of the length to the short diameter of the elliptical pit is between 2 and 6.

[0014] Furthermore, in the joint prosthesis, the first structure is a femoral condyle, which includes a first joint surface; the second structure is a tibial pad, which includes a second joint surface, a back surface of the tibial pad and a groove located on the back surface of the tibial pad, and the second joint surface is in direct contact with the first joint surface; the third structure is a tibial tray, which includes a support column and a support plate, and the support column is in direct contact with the groove, and the support plate is in direct contact with the back surface of the tibial pad.

[0015] Furthermore, in the joint prosthesis, the surface of the second joint surface, the surface of the pillar and the surface of the support plate are textured surfaces.

[0016] Preferably, in the joint prosthesis, the texture is an array of elliptical pits, and the direction of the long diameter of the ellipse is parallel to the movement direction of the reciprocating friction motion.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The joint prosthesis provided by the present invention comprises a first structure and a second structure, wherein the first structure and the second structure are in direct contact and can perform reciprocating frictional motion, and at least one of the surfaces in direct contact between the first structure and the second structure is a surface with a texture, and in at least one surface with a texture, the area ratio of the texture is between 10% and 20%. Since the joint prosthesis is designed with a contact surface with a texture, and the area ratio of the texture is between 10% and 20%, the friction performance between the surfaces in direct contact in the joint prosthesis can be effectively improved, that is, the friction coefficient between the first structure and the second structure in reciprocating frictional motion can be reduced, and the wear between the surfaces in direct contact can be reduced, thereby extending the service life of the joint prosthesis.

[0019] Furthermore, the texture is an array of elliptical pits, and the ratio of the area occupied by the elliptical pits to the total area of ​​the textured surface is between 15% and 20%, the depth of the elliptical pits is between 8μm and 15μm, and the ratio of the length to short diameter of the elliptical pits is between 2 and 8. At the same time, when the direction of the long diameter of the ellipse is parallel to the movement direction of the reciprocating friction motion, the friction coefficient of the contact surface with the texture is relatively lower, the friction performance is better, and it is more conducive to extending the service life of the joint prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a knee joint prosthesis according to the present invention;

[0021] Figure 2 A schematic structural diagram of a femoral condyle of a knee joint prosthesis according to the present invention;

[0022] Figure 3a and Figure 3b The schematic diagrams of the structure of the front and back sides of the tibial pad of the knee joint prosthesis of the present invention are shown respectively;

[0023] Figure 4 It is a schematic structural diagram of a tibial tray of a knee joint prosthesis according to the present invention;

[0024] Figure 5 : is a relationship diagram between the speed and friction coefficient of reciprocating friction motion corresponding to the pit surfaces of different shapes obtained through simulation tests in an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of a partially enlarged top view of the glenoid surface with a textured surface on the front side of the tibial pad in an embodiment of the present invention;

[0026] Figure 7 It is a partially enlarged cross-sectional structural schematic diagram of the contact surface between the first articular surface of the femoral condyle and the front surface of the tibial pad in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The joint prosthesis and the method for making the same of the present invention will be described in more detail below in conjunction with the schematic diagram, wherein preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art may modify the present invention described herein without departing from the concept of the present invention, and still achieve the advantageous effects of the present invention. Therefore, the following description is not intended to limit the present invention.

[0028] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and in an inaccurate scale, which is only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention and is not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same figure marks represent the same or similar parts. The upper and lower relationships of the layers of the present invention include upper and lower corresponding relationships when in direct contact or indirect contact.

[0029] The core idea of ​​the present invention is that the present invention provides a joint prosthesis, including: a first structure and a second structure, the first structure and the second structure are in direct contact and can move reciprocatingly with friction, at least one of the surfaces in direct contact between the first structure and the second structure is a textured surface, and in at least one of the textured surfaces, the area ratio of the texture is between 10% and 20%.

[0030] The joint prosthesis provided by the present invention is designed with a contact surface with a texture, and the area ratio of the texture is between 10% and 20%, which can effectively improve the friction performance between the surfaces in direct contact in the joint prosthesis, that is, it can reduce the friction coefficient between the first structure and the second structure in reciprocating friction motion, reduce the wear between the surfaces in direct contact, and thus extend the service life of the joint prosthesis.

[0031] The following takes a knee joint prosthesis as an example to clearly illustrate the content of the present invention. It should be clear that the content of the present invention is not limited to the following embodiments, and other improvements through conventional technical means of ordinary technicians in this field are also within the scope of the concept of the present invention.

[0032] First, see Figures 1 to 4 The knee joint prosthesis mainly includes the following three parts: a first structure, the first structure is a femoral condyle 1; a second structure, the second structure is a tibial pad 2; a third structure, the third structure is a tibial tray 3, as shown in FIG. Figure 1 Specifically, the femoral condyle 1 includes a medial condyle 11, a lateral condyle 12, a first articular surface 13 defined by the medial condyle 11 and the lateral condyle 12, a femoral trochlea 14, an intercondylar box 15, a stabilizing column 16, an inner condylar joint inner surface 17, and a holding notch 18, as shown in FIG. Figure 2 As shown, the first joint surface 13 is in direct contact with the tibial pad 2; the front side of the tibial pad 2 is a second joint surface 25 composed of a first glenoid surface 21 and a second glenoid surface 22, as shown in FIG. Figure 3a As shown, the second joint surface 25 is in direct contact with the first joint surface 13 and can perform reciprocating frictional motion. The back of the tibial pad 2 is a tibial pad back surface 24 and a groove 23 arranged on the back surface of the tibial pad. Figure 3bAs shown; the tibial tray 3 includes a support column 31, a support plate 32 and a fixing structure, and the fixing structure includes a fixing keel 33 and a plurality of reinforcing ribs 34. Figure 4 As shown, the groove 23 of the tibial pad is in direct contact with the support column 31 and can move back and forth with friction, and the back surface 24 of the tibial pad is in direct contact with the support plate 32 and can move back and forth with friction.

[0033] Usually, the material of the tibial pad 2 is ultra-high molecular weight polyethylene (UHMWPE), and the material of the femoral condyle 1 and the tibial tray 3 is a medical metal material, such as one or more alloy metals of metal Co, Cr, Mo or Ti. Because in the cooperation between the tibial pad 2 of ultra-high molecular weight polyethylene and the femoral condyle 1 of medical metal material, the tibial pad 2 needs to bear very high stress, and as the femoral condyle 1 rolls back and forth (reciprocating friction motion), there is a lot of friction between the tibial pad 2 and the femoral condyle 1; in the cooperation between the tibial pad 2 and the tibial tray 3, due to the combination mode and the surface treatment mode of the tibial tray 3 platform, the back side 24 of the tibial pad is also prone to wear. Research in the field of surface engineering and tribology has shown that surface texture technology (especially surface micro-texture technology) can significantly improve the tribological properties of the contact surface. In the field of surface engineering and tribology, surface texture (Surface Texture) refers to a solid surface with a certain regular three-dimensional morphology, that is, the contact surface is formed into a textured surface by surface texture technology, which can improve the tribological properties of the contact surface.

[0034] Therefore, the inventors have found that when the texture of the direct contact surface of the joint is pitted, these pits can form a lubricating film on the friction surface by storing lubricating fluid between the soft tissues of the knee, thereby improving the contact mode and lubrication state of the friction surface and reducing the friction and wear between the friction. In addition, when the lubricating fluid is sufficient, the texture of the pits can also be used as a micro-dynamic lubrication bearing to enhance the fluid dynamic pressure effect and improve the bearing capacity of the components; in the absence of lubricating fluid, the texture of the pits can capture tiny wear particles, thereby reducing the surface wear rate, and the pit texture can also reduce the contact area of ​​the contact surface and reduce the adhesion effect. It should be pointed out that the surface morphology with pits can also be understood from another perspective that the morphology of the texture is convex, that is, if the lowest point of the pits is used as the reference line, the part between the pits is convex.

[0035] Furthermore, the inventors of the present invention have found that the friction coefficient can be effectively reduced by changing the geometric parameters of the micro-texture, such as shape, size, area ratio, depth and arrangement. The inventors of the present invention have conducted in-depth research on the unique contact and movement modes of the femoral condyle, tibial pad and tibial tray.

[0036] The knee joint is a double joint structure consisting of the tibiofemoral joint (medial tibiofemoral joint surface, lateral tibiofemoral joint surface) and the patellar joint. The front 1 / 3 of the lateral tibiofemoral joint surface is a gradually rising concave surface, while the rear 2 / 3 is a gradually descending concave surface. The medial tibiofemoral joint surface is a bowl-shaped depression. The tibial pad simulates this shape, so that it can match the femoral condyle, so that the replaced joint can be flexed and extended. When the knee joint is in the extended position, the tibial pad and the femoral condyle are completely matched, and the lubricating fluid is squeezed out. The texture design of the tibial pad surface can maintain the stability of the knee joint. In addition, processing micro-textures on the surface of the tibial tray can improve its load-bearing capacity. The matching degree in the flexion position is reduced, allowing tibia-femoral sliding. The micro-texture on the surface of the tibial pad releases tissue fluid and improves lubrication performance. When the knee joint is flexed and extended, the contact surface of the tibial pad and the femoral condyle reciprocates, so processing micro-pit textures on the contact surface can effectively improve its friction performance and reduce wear. The knee joint bears most of the body's weight, so the replacement tibial tray needs to have good load-bearing capacity. In addition, the femoral condyle and tibial pad are subject to the most frequent reciprocating motion when simulating knee joint motion.

[0037] In response to these requirements, the inventors designed pits of different shapes and conducted experimental comparisons, and concluded that when the shape of the pit is elliptical and the direction of the long diameter of the ellipse is parallel to the direction of reciprocating friction motion, the friction coefficient is relatively low and the friction performance is relatively good. Specifically, micro-pits of different shapes are processed on the surface of the stainless steel sample block, and the designed comparative experimental items and specific parameters are shown in Table 1 (Table 1 shows the comparative experimental items and specific parameters of pits of different shapes, wherein the rightward arrow in the figure indicates the movement direction v of the reciprocating friction motion), by designing the single pit area, the depth of the pit (the depth refers to the vertical distance from the plane where the opening of the pit is located to its lowest point) and the area ratio of the pit (the ratio of the area occupied by all pits to the total area of ​​the surface with texture is the area ratio of the pit, and correspondingly, the area ratio of the texture is the ratio of the area occupied by the texture on the surface with texture to the total area of ​​the surface with texture) to be the same, the sample surface of pits of different shapes (such as circular, square and elliptical) has different sizes of pits of different shapes, such as the size of the circular pit corresponds to the diameter of the pit, the size of the square pit corresponds to the side length of the pit, and the size of the elliptical pit corresponds to the major diameter / minor diameter (also known as the aspect ratio) of the elliptical pit.

[0038] Table 1

[0039]

[0040] Then, the above three sample surfaces were subjected to experiments simulating the reciprocating friction motion of joint prostheses. In the experiment, the load of the test machine was 100 Newtons, and the speed of the reciprocating friction motion was gradually increased from 200 times / minute to 700 times / minute. During the experiment, an appropriate amount of lubricant was continuously added to simulate the motion environment between the femoral condyle, tibial pad and tibial tray. The friction coefficient obtained is as follows Figure 5 As shown, Figure 5 The figure is the relationship between the speed of reciprocating friction motion and its friction coefficient corresponding to the pit surface of different shapes. Figure 5 It can be clearly seen that when the area ratio, depth and speed of the reciprocating friction motion of the pits are consistent, the friction coefficient of the elliptical pits is significantly smaller than the friction coefficients of the other two pits, followed by the square pits and finally the circular pits.

[0041] Based on the above research results, the inventors further studied the influence of different factors on the joint surface of the elliptical pit on its friction coefficient, such as the influence of different area ratios A, depths B and aspect ratios C on its friction coefficient. Specifically, Figure 6 and Figure 7 As shown, Figure 6 FIG. 2 is a schematic diagram of a partially enlarged top view of the glenoid surface (second joint surface 25) having a textured surface on the front side of the tibial pad. Figure 7 The second articular surface 25 has a texture composed of elliptical pits 250, and the aspect ratio C of the elliptical pits 250 is equal to L / d, and the depth B of the elliptical pits 250 is equal to h. In order to accurately study the optimal parameter range, the inventors designed three groups of comparative tests, each of which had 7 test numbers. The parameter values ​​of the specific comparative items are shown in Tables 2, 3 and 4, respectively. Table 2 shows the friction coefficient of the surface of the elliptical pit 250 at the same depth B (10 μm) and aspect ratio C (4) and different area ratios A (2% to 30%); Table 3 shows the friction coefficient of the surface of the elliptical pit 250 at the same area ratio A (20%) and aspect ratio C (4) and different depths B (2 μm to 30 μm); Table 4 shows the friction coefficient of the surface of the elliptical pit 250 at the same area ratio A (20%) and depth B (10 μm) and different aspect ratios C (1 to 10).

[0042] Table 2

[0043]

[0044]

[0045] Table 3

[0046]

[0047] Table 4

[0048]

[0049] Then, a simulation experiment was conducted on a reciprocating friction and wear tester for each test number in the above table, simulating the motion between the femoral condyle and the tibial pad, and the friction coefficients of the surfaces with different pit textures were measured, as shown in Tables 2, 3 and 4 above. The motion speed of the reciprocating friction motion in the experiment was a fixed value, such as 500 times / minute, and the load of the test machine was 100 Newtons. At the same time, an appropriate amount of lubricant was continuously added during the experiment to simulate the motion environment between the femoral condyle 1, the tibial pad 2 and the tibial tray 3. From the above friction coefficient results, it can be seen that the area ratio A of the elliptical pit is preferably 10% to 20% (its friction coefficient is less than 0.09), and more preferably 15% to 20% (its friction coefficient is less than 0.07); the depth B of the elliptical pit is preferably 5μm to 15μm (its friction coefficient is less than 0.13), and more preferably 8μm to 15μm (its friction coefficient is about less than 0.10); the aspect ratio C of the elliptical pit is preferably 2 to 8 (its friction coefficient is about less than 0.10), and more preferably 2 to 6 (its friction coefficient is about less than 0.08). Therefore, when the geometric parameters of the elliptical pit are within the above range, its friction coefficient is relatively low and the friction performance is also better.

[0050] Furthermore, in order to consider the influence of the interaction between the various factors of the elliptical pit 250 on its friction coefficient, the inventor conducted a more in-depth study. A four-factor three-level orthogonal test was used to explore the influence of different area ratios A, depths B and aspect ratios C on its friction coefficient. The factor level table of the four-factor three-level is shown in Table 5. Then, under the same test conditions as mentioned above (i.e., the speed of the reciprocating friction motion is 500 times / minute, the load of the testing machine is 100 Newtons, and lubricants are continuously added between the friction surfaces), the test was carried out, and the measured friction coefficients of the surfaces with different elliptical pit textures are shown in Table 6. It should be noted that four factors are used in the design, and a blank column is added. Those skilled in the art can understand that this is to improve the accuracy and reliability of the test and to consider the interaction of the uncertainties (or contingencies) in the test on the three factors.

[0051] Table 5

[0052]

[0053] Table 6

[0054]

[0055]

[0056] Among them, k1, k2, and k3 in Table 6 refer to the average values ​​of the indicators of each level of each factor, and the corresponding optimal level of each factor can also be obtained from this. In this test, the corresponding friction coefficient is used as the test indicator, which means that the smaller k is, the better the friction performance of the surface. The smallest k value among the three levels of the area ratio A factor is k3=0.075 (i.e. A3 in the optimal level), the smallest k value among the three levels of the depth B factor is k2=0.075 (i.e. B2 in the optimal level), and the smallest k value among the three levels of the aspect ratio C factor is k2=0.083 (i.e. C2 in the optimal level). By analyzing the average values ​​of the indicators of each factor above, it can be concluded that: in the orthogonal test designed above, under the set test conditions, the best theoretical combination (optimal combination) is A3B2C2, that is, when the area ratio A of the elliptical pit is 20%, the depth B is 10μm, and the aspect ratio C is 4, the tribological performance of the contact surface is optimal. In addition, the best theoretical combination obtained is also verified by the above Tables 2, 3, and 4.

[0057] In addition, through the above orthogonal test, the range value R can also be calculated. The range value R corresponds to the degree of influence of the test factors on the test result indicators. The importance of each factor on the friction performance can be ranked by sorting according to the size of the range value R. In the above test, the larger the range value R, the stronger the influence of the factor on the surface friction performance, and vice versa. Therefore, from the analysis of Table 6, it can be seen that the area ratio A has the greatest influence on the friction performance, followed by the depth B, and the aspect ratio C has the least influence (that is, the primary and secondary order is area ratio A>depth B>aspect ratio C).

[0058] Preferably, in this embodiment, a surface having the elliptical pits 250 can be formed on the second articular surface 25 composed of the first articular glenoid surface 21 and the second articular glenoid surface 22 on the front of the tibial pad 2 by chemical etching or laser technology. For example, the required elliptical pits 250 can be made on the above surface by changing the pump current of a laser (such as a YG laser) and the number of laser repetitions. The use of laser technology for processing is not only simple to process, short in time, and less polluting, but also has a wide range of processing objects. Both metal surfaces and polymer material surfaces can be processed. The size and morphology of the texture obtained by processing can meet higher precision requirements, and its tribological performance is more superior. In addition, the elliptical pits 250 can be evenly distributed on any directly contacting surface, or they can be unevenly distributed, such as the elliptical pits 250 can be distributed in an array.

[0059] Obviously, in other embodiments, the knee joint prosthesis can also design the first joint surface 13, the back surface 24 and the groove 23 of the tibial pad or any surface of the pillar 31 and the support plate 32 of the tibial tray 3 as a textured surface, and the area ratio of the texture is between 10% and 20%. That is, by ensuring that at least one surface of the contact surface in the knee joint prosthesis is a textured surface, the purpose of reducing the friction coefficient and extending the service life of the knee joint prosthesis can be achieved.

[0060] In addition, this embodiment only takes the knee joint prosthesis as an example, while in other embodiments, the joint prosthesis may be but is not limited to a hip joint prosthesis, a shoulder joint prosthesis, an elbow joint prosthesis, an ankle joint prosthesis, etc., which are not introduced one by one here.

[0061] The joint prosthesis provided by the present invention comprises a first structure and a second structure, wherein the first structure and the second structure are in direct contact and can perform reciprocating frictional motion, and at least one of the surfaces in direct contact between the first structure and the second structure is a surface with a texture, and in at least one surface with a texture, the area ratio of the texture is between 10% and 20%. Since the joint prosthesis is designed with a contact surface with a texture, and the area ratio of the texture is between 10% and 20%, the friction performance between the surfaces in direct contact in the joint prosthesis can be effectively improved, that is, the friction coefficient between the first structure and the second structure in reciprocating frictional motion can be reduced, and the wear between the surfaces in direct contact can be reduced, thereby extending the service life of the joint prosthesis.

[0062] Furthermore, the texture is an array of elliptical pits, and the ratio of the area occupied by the elliptical pits to the total area of ​​the textured surface is between 15% and 20%, the depth of the elliptical pits is between 8μm and 15μm, and the ratio of the length to short diameter of the elliptical pits is between 2 and 8. At the same time, when the direction of the long diameter of the ellipse is parallel to the movement direction of the reciprocating friction motion, the friction coefficient of the contact surface with the texture is relatively lower, the friction performance is better, and it is more conducive to extending the service life of the joint prosthesis.

[0063] Obviously, the above embodiments are only preferred embodiments of the present invention, and therefore, the above embodiments are not intended to limit the present invention. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A joint prosthesis, characterized in that: include: A first structure, a second structure and a third structure, wherein the first structure and the second structure are in direct contact and can perform reciprocating friction motion, and the third structure and the second structure are in direct contact and can perform reciprocating friction motion. Among the surfaces in direct contact between the first structure and the second structure, and among the surfaces in direct contact between the third structure and the second structure, at least one surface is a textured surface, and in at least one surface with a texture, the area ratio of the texture is between 10% and 20%; the texture is elliptical pits distributed in an array, and the direction of the long diameter of the ellipse is parallel to the movement direction of the reciprocating friction motion; the area ratio of the elliptical pits is 10% to 20%, the depth of the elliptical pits is 5um to 15um, and the aspect ratio of the elliptical pits is 2 to 8, which can reduce the friction coefficient in reciprocating friction motion and reduce the wear between surfaces in direct contact.

2. The joint prosthesis according to claim 1, characterized in that: The ratio of the area occupied by the elliptical pits to the total area of ​​the textured surface is between 15% and 20%.

3. The joint prosthesis according to claim 1, characterized in that: The depth of the elliptical pit is between 8 μm and 15 μm.

4. The joint prosthesis according to claim 1, characterized in that: The aspect ratio of the elliptical pit is between 2 and 6.

5. The joint prosthesis according to claim 1, characterized in that: The first structure is a femoral condyle, which includes a first joint surface; the second structure is a tibial pad, which includes a second joint surface, a back side of the tibial pad and a groove located on the back side of the tibial pad, and the second joint surface is in direct contact with the first joint surface; the third structure is a tibial tray, which includes a support column and a support plate, and the support column is in direct contact with the groove, and the support plate is in direct contact with the back side of the tibial pad.

6. The joint prosthesis according to claim 5, characterized in that: The surface of the second joint surface, the surface of the post and the surface of the support plate are textured surfaces.

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