Composite ceramic knee prosthesis and manufacturing process

Abstract

This application relates to the technical field of medical devices, and in particular to a composite ceramic knee joint prosthesis and its manufacturing process, comprising a tibial support, a tibial pad, and a femoral condyle. The tibial pad is disposed on the tibial support, and the femoral condyle is disposed on the tibial pad. The femoral condyle and the tibial support are made of titanium alloy or cobalt-chromium-molybdenum alloy. The surfaces of the femoral condyle and the tibial support adjacent to the tibial pad are the outer surfaces, and the outer surfaces of the femoral condyle and the tibial support are respectively coated with a ceramic coating. The tibial pad is made of highly cross-linked ultra-high molecular weight polyethylene mixed with vitamin E. This application has the effect of reducing the possibility of prosthesis wear and failure.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and in particular to a composite ceramic knee joint prosthesis and its manufacturing process. Background Technology

[0002] Currently, knee osteoarthritis (degenerative changes and bone hyperplasia of the knee joint) is a common disease among the elderly. In the early stages, the main symptoms are knee pain and discomfort, which worsens after exposure to cold or exertion, and knee swelling may occur. As the local lesions worsen, knee pain becomes more pronounced, walking becomes difficult, and in severe cases, varus or valgus deformities of the knee joint may occur, significantly reducing the patient's quality of life.

[0003] For patients with severe knee joint disease, the most effective treatment to relieve joint pain, improve joint function, correct joint deformities, and achieve long-term knee stability is total knee replacement surgery.

[0004] Total knee replacement surgery is a surgical procedure that removes worn, diseased, or damaged surfaces of the knee joint and replaces them with an artificial knee prosthesis. A knee prosthesis typically includes the femoral condyle, tibial support, tibial pad, and patella.

[0005] Regarding the aforementioned technologies: After knee replacement, wear and tear will occur between the knee prostheses, affecting the support stability of the replaced knee joint and ultimately leading to prosthesis wear and failure. Summary of the Invention

[0006] To reduce the possibility of prosthesis wear and failure, this application provides a composite ceramic knee joint prosthesis and its manufacturing process.

[0007] This application provides a composite ceramic knee joint prosthesis, which adopts the following technical solution:

[0008] A composite ceramic knee joint prosthesis includes a tibial support, a tibial pad, and a femoral condyle. The tibial pad is disposed on the tibial support, and the femoral condyle is disposed on the tibial pad. The femoral condyle and the tibial support are made of titanium alloy or cobalt-chromium-molybdenum alloy. The surfaces of the femoral condyle and the tibial support near the tibial pad are the outer surfaces. The outer surfaces of the femoral condyle and the tibial support are respectively coated with a ceramic coating. The tibial pad is made of highly cross-linked ultra-high molecular weight polyethylene mixed with vitamin E.

[0009] By adopting the above technical solution, a ceramic coating is applied to the outer surface of the femoral condyle and tibial support, which helps to reduce the roughness of the outer surface of the femoral condyle and tibial support. Furthermore, the tibial pad is made of highly cross-linked ultra-high molecular weight polyethylene mixed with vitamin E, which improves the tibial pad's resistance to oxidation degradation and wear. In this way, through the cooperation of the tibial pad, femoral condyle, and tibial support, the wear of the prosthesis is reduced to a certain extent, which helps to reduce the possibility of prosthesis wear failure and improves the service life of the prosthesis.

[0010] Optionally, the femoral condyle and the tibial support can be 3D printed.

[0011] By adopting the above technical solution, it is easier to manufacture the femoral condyle and tibial support.

[0012] Optionally, the ceramic coating is made of nano-glaze.

[0013] By adopting the above technical solution, the ceramic coating is made of nano-glaze, which helps to improve the antibacterial ability of the prosthesis.

[0014] Optionally, the surface of the femoral condyle and the tibial support away from the tibial pad is the inner surface, and the inner surface of the femoral condyle and the tibial support is provided with a vacuum plasma coating, which is made of titanium, or a titanium and hydroxyapatite composite, or pure tantalum material.

[0015] By adopting the above technical solution, the inner surface of the femoral condyle and tibial support is vacuum plasma sprayed to form a vacuum plasma coating, which is conducive to promoting good bone ingrowth.

[0016] Optionally, the tibial pad includes an upper pad and a lower pad that is slidably fitted on the upper pad. An adjustment mechanism is provided between the upper pad and the lower pad, and the adjustment mechanism is used to adjust the distance between the upper pad and the lower pad.

[0017] By adopting the above technical solution, the adjustment mechanism is used to adjust the distance between the upper and lower pads, which is beneficial to adjust the distance between the upper and lower pads according to the patient's actual needs, so that the tibial pad can adapt to the patient's actual needs. This makes it easier for doctors to adjust the height of the tibial pad according to the patient's actual situation during total knee replacement surgery, which simplifies the surgical procedure of total knee replacement surgery to a certain extent.

[0018] Optionally, the upper pad sleeve has a first receiving groove, and the lower pad sleeve has a second receiving groove. The first receiving groove and the second receiving groove communicate to form a receiving cavity. The adjusting mechanism includes an elastic element and a limiting adjusting component. The elastic element is disposed in the receiving cavity and abuts against the inner walls of the first receiving groove and the second receiving groove, respectively. The elastic element is used to push the upper pad sleeve and the lower pad sleeve to move in opposite directions. The limiting adjusting component is used to restrict the movement of the upper pad sleeve and the lower pad sleeve.

[0019] By adopting the above technical solution, the elastic element and the limiting adjustment component work together to facilitate the adjustment of the distance between the upper and lower pads. Furthermore, both the elastic element and the limiting adjustment component are located within the receiving cavity, thereby reducing the possibility of interference between the elastic element and the limiting adjustment component and human tissue after the prosthesis is implanted into the human body.

[0020] Optionally, the limiting adjustment assembly includes an adjusting sleeve and a limiting rotating rod. The adjusting sleeve is fixedly installed in the first receiving groove. A first stop is provided on the inner wall of the adjusting sleeve. One end of the limiting rotating rod passes through the upper pad and the adjusting sleeve in sequence and is rotatably connected to the lower pad. A second stop is provided on the circumferential side wall of the limiting rotating rod. The side of the first stop near the upper pad abuts against the second stop.

[0021] By adopting the above technical solution, when the first stop block and the second stop block are in contact, the elastic element is not easy to push the upper and lower pads to move; when it is necessary to push the upper and lower pads to move, the limiting rod is rotated, and the limiting rod drives the second stop block to move, so that the second stop block and the first stop block are misaligned, thereby making it easier for the elastic element to push the upper and lower pads to move, and thus making it easier to adjust the distance between the upper and lower pads.

[0022] Optionally, multiple first stops are provided, and the multiple first stops are evenly distributed around the axis of the adjusting sleeve and along the length direction of the adjusting sleeve, and the second stops can abut against different first stops respectively.

[0023] By adopting the above technical solution, multiple first blocks are provided, so that when the second block is misaligned with one of the first blocks, when the elastic element pushes the upper and lower pads to move, the second block can abut against the next first block, thereby limiting the upper and lower pads again, making it difficult for the elastic element to push the upper and lower pads to move, thus facilitating precise adjustment of the distance between the upper and lower pads.

[0024] Optionally, a limiting sleeve is provided on the inner wall of the receiving cavity, and the elastic element is disposed inside the limiting sleeve.

[0025] By adopting the above technical solution, the limiting sleeve can limit the elastic element, making it less likely for the elastic element to tip over in the cavity, thereby facilitating the elastic element to always apply a thrust to the upper and lower pads.

[0026] A manufacturing process for a composite ceramic knee joint prosthesis. The composite ceramic knee joint prosthesis, including any one of the above-described features, comprises the following steps:

[0027] Based on the design model, the femoral condyle and tibial support are made of titanium alloy or cobalt-chromium-molybdenum alloy;

[0028] Tibial pads are made of highly cross-linked ultra-high molecular weight polyethylene mixed with vitamin E.

[0029] The outer surfaces of the femoral condyle and tibial support are coated with nano-glaze to form a ceramic coating;

[0030] The femoral condyle and tibial support are subjected to vacuum high-temperature sintering treatment;

[0031] The femoral condyle and tibial support are treated with hot isostatic pressing.

[0032] The ceramic coating surface is polished to achieve a mirror finish.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. By applying a ceramic coating to the outer surface of the femoral condyle and tibial support, in conjunction with the tibial pad, the possibility of prosthesis wear and failure is reduced to a certain extent, thereby helping to improve the service life of the prosthesis;

[0035] 2. Through the cooperation of elastic elements, adjusting sleeves, limiting rotating rods, first stop blocks and second stop blocks, the distance between the upper and lower pads can be precisely adjusted, so that the height of the tibial pad can be adjusted to suit the actual situation of the patient. This makes it easier for doctors to adjust the height of the tibial pad according to the actual situation of the patient during total knee replacement surgery, and simplifies the surgical procedure of total knee replacement surgery to a certain extent.

[0036] 3. The setting of the limiting sleeve makes it difficult for the elastic element to tip over in the receiving cavity, thus making it easy for the elastic element to always apply a thrust to the upper and lower pads. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the composite ceramic knee joint prosthesis of Embodiment 1 of this application.

[0038] Figure 2 yes Figure 1 A cross-sectional view of the tibial pad along line AA.

[0039] Figure 3yes Figure 2 A schematic diagram of the structure at point B.

[0040] Figure 4 This is a schematic diagram of the adjusting sleeve in Embodiment 2 of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Tibial support; 2. Tibial pad; 21. Upper pad sleeve; 211. First protrusion; 212. First receiving groove; 213. Protective sleeve; 22. Lower pad sleeve; 221. Second protrusion; 222. Second receiving groove; 3. Femoral condyle; 4. Ceramic coating; 5. Vacuum plasma coating; 6. Adjustment mechanism; 61. Elastic element; 62. Limit adjustment assembly; 621. Adjustment sleeve; 6211. First stop; 622. Limiting rod; 6221. Second stop; 63. Limiting sleeve. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0044] This application discloses a composite ceramic knee joint prosthesis and its manufacturing process.

[0045] Example 1

[0046] Reference Figure 1 A composite ceramic knee joint prosthesis includes a tibial support 1, a tibial pad 2, and a femoral condyle 3. The tibial pad 2 is engaged with the top surface of the tibial support 1, and the femoral condyle 3 is located on the top surface of the tibial pad 2, and the femoral condyle 3 is rotatable relative to the tibial pad 2.

[0047] Reference Figure 1 In this embodiment, the femoral condyle 3 and tibial support 1 are both made of forged titanium alloy, cobalt-chromium-molybdenum alloy, or 3D printed. Titanium alloy and cobalt-chromium-molybdenum alloy materials have good biocompatibility, and compared with ceramic materials, titanium alloy and cobalt-chromium-molybdenum alloy materials have the advantages of being lightweight and shatter-resistant.

[0048] Reference Figure 1 The outer surface of the femoral condyle 3 and the tibial support 1 near the tibial pad 2 is used as the outer surface, and the inner surface of the femoral condyle 3 and the tibial support 1 away from the tibial pad 2 is used as the inner surface. In this embodiment, the outer surface of the femoral condyle 3 and the outer surface of the tibial support 1 are coated with nano-glaze to form a ceramic coating 4.

[0049] The ceramic coating 4 can also be made of composite glazes such as zirconium oxide, alumina or silicon nitride.

[0050] The surface of ceramic coating 4 has high hardness. After polishing, the surface roughness of ceramic coating 4 can reach Ra0.02 or higher, which helps to reduce the wear coefficient of the prosthesis.

[0051] Reference Figure 1 In this embodiment, the thickness of the nano-glaze applied to the outer surface of the femoral condyle 3 and the outer surface of the tibial support 1 is 0.01-0.5 mm.

[0052] Reference Figure 1 In this embodiment, the inner surfaces of the femoral condyle 3 and the tibial support 1 are coated with a vacuum plasma coating 5 using vacuum plasma spraying. The coating material can be titanium, a titanium and hydroxyapatite composite, or pure tantalum, etc., thereby promoting better bone ingrowth after the femoral condyle 3 and tibial support 1 are implanted into the human body. In this embodiment, the thickness of the vacuum plasma coating 5 is 0.25-1.5 mm.

[0053] Reference Figure 1 In this embodiment, the tibial pad 2 is made of highly cross-linked ultra-high molecular weight polyethylene material infused with vitamin E. This material possesses excellent impact resistance, wear resistance, crack resistance, and oxidation resistance. This helps reduce the generation of wear particles and, to some extent, mitigates postoperative osteolysis.

[0054] This application provides a composite ceramic knee joint prosthesis. By applying a ceramic coating 4 to the outer surface of the femoral condyle 3 and the outer surface of the tibial support 1, and using a highly cross-linked ultra-high molecular weight polyethylene material mixed with vitamin E to make the tibial pad 2, the wear coefficient between the femoral condyle 3 and the tibial pad 2 and between the tibial support 1 and the tibial pad 2 is reduced. This helps to reduce the wear rate of the prosthesis, thereby reducing the possibility of prosthesis wear failure and extending the service life of the prosthesis to a certain extent.

[0055] Example 2

[0056] The difference between Example 2 and Example 1 is that the structure of the tibial pad 2 is different.

[0057] Reference Figure 1 and Figure 2 The tibial pad 2 includes an upper pad sleeve 21 and a lower pad sleeve 22 that slides on the upper pad sleeve 21. The upper pad sleeve 21 is used to connect with the femoral condyle 3, and the lower pad sleeve 22 is used to connect with the tibial support 1. An adjustment mechanism 6 is provided between the upper pad sleeve 21 and the lower pad sleeve 22 to adjust the distance between them.

[0058] Reference Figure 3 In this embodiment, the upper pad 21 is fixedly connected to a first protrusion 211 at one end near the lower pad 22, and one end of the first protrusion 211 extends away from the center of the upper pad 21. The lower pad 22 is fixedly connected to a second protrusion 221 at one end near the upper pad 21, and the second protrusion 221 extends towards the center of the lower pad 22.

[0059] When the lower pad 22 is fitted onto the upper pad 21, the first protrusion 211 can abut against the second protrusion 221, limiting the upper pad 21 and the lower pad 22, thereby reducing the possibility of the upper pad 21 and the lower pad 22 separating from each other.

[0060] Reference Figure 2 and Figure 3 The upper pad 21 has a first receiving groove 212 on the side near the first protrusion 211, and the lower pad 22 has a second receiving groove 222 on the side near the second protrusion 221. When the lower pad 22 is fitted onto the upper pad 21, the first receiving groove 212 and the second receiving groove 222 communicate to form a receiving cavity.

[0061] Reference Figure 2 The adjustment mechanism 6 includes an elastic element 61, a limit adjustment component 62, and a limit sleeve 63. In this embodiment, the limit sleeve 63 is fixedly connected to the inner wall of the second receiving groove 222, and multiple limit sleeves 63 can be provided, with multiple limit sleeves 63 evenly distributed on the inner wall of the second receiving groove 222.

[0062] Reference Figure 2 In this embodiment, the elastic element 61 includes a spring. The elastic element 61 is disposed inside the limiting sleeve 63, which can limit the elastic element 61, making it less likely for the elastic element 61 to tilt within the receiving cavity. Furthermore, the elastic element 61 abuts against the inner walls of the first receiving groove 212 and the second receiving groove 222, thereby facilitating the elastic element 61 to push the upper pad 21 and the lower pad 22 to move in opposite directions.

[0063] Reference Figure 2 The limit adjustment assembly 62 includes an adjustment sleeve 621 and a limit rotating rod 622. The adjustment sleeve 621 is fixedly installed on the inner wall of the first receiving groove 212 and is located in the middle of the upper pad 21, and can move with the movement of the upper pad 21.

[0064] Reference Figure 2 and Figure 4 Multiple first blocks 6211 are fixedly connected to the inner wall of the adjusting sleeve 621. The multiple first blocks 6211 surround the axis of the adjusting sleeve 621 and are evenly distributed along the length of the adjusting sleeve 621, and adjacent first blocks 6211 are staggered.

[0065] Reference Figure 2 One end of the limiting rotating rod 622 passes through the upper pad 21 and the adjusting sleeve 621 in sequence, and is rotatably connected to the lower pad 22, so that the limiting rotating rod 622 and the upper pad 21 can both rotate and slide, and the limiting rotating rod 622 and the lower pad 22 can only rotate relative to each other and cannot slide relative to each other.

[0066] Reference Figure 2 A second stop 6221 is fixedly connected to the circumferential side wall of the limiting rotating rod 622. When the limiting rotating rod 622 is inserted into the adjusting sleeve 621, the second stop 6221 can abut against the side of the first stop 6211 near the upper pad 21, thereby facilitating the limiting of the upper pad 21 and the lower pad 22, making it difficult for the elastic member 61 to push the upper pad 21 and the lower pad 22 to move.

[0067] Reference Figure 2 The end of the limiting rod 622 away from the lower pad 22 extends to the outside of the upper pad 21, thereby facilitating the rotation of the limiting rod 622.

[0068] When it is necessary to adjust the distance between the upper sleeve 21 and the lower sleeve 22, the limiting rod 622 is rotated, causing the limiting rod 622 to drive the second stop 6221 to rotate, thereby causing the second stop 6221 to be misaligned with a first stop 6211. At this time, the first stop 6211 and the second stop 6221 no longer limit the upper sleeve 21 and the lower sleeve 22, allowing the elastic element 61 to push the upper sleeve 21 and the lower sleeve 22 to move a certain distance in opposite directions. Then the second stop 6221 abuts against the next first stop 6211, limiting the upper sleeve 21 and the lower sleeve 22 again, thus facilitating precise adjustment of the distance between the upper sleeve 21 and the lower sleeve 22.

[0069] Reference Figure 2 A protective sleeve 213 can be connected to the side of the upper pad 21 opposite to the lower pad 22 via screws. The protective sleeve 213 is fitted onto the end of the limiting rod 622 that protrudes from the upper pad 21, thereby reducing the possibility of the limiting rod 622 rotating under external force. Furthermore, the shape of the protective sleeve 213 is adapted to the design of the femoral condyle 3, which helps to reduce the possibility of the protective sleeve 213 adversely affecting the normal operation of the prosthesis.

[0070] The implementation principle of Embodiment 2 of this application is as follows: when it is necessary to implant the prosthesis into the human body, the height of the tibial pad 2 is first adjusted according to the patient's actual needs.

[0071] First, the limiting rod 622 is rotated, causing the second stop 6221 to rotate, thus misaligning the second stop 6221 with the first stop 6211. At this time, the elastic element 61 pushes the upper pad 21 and the lower pad 22 to move a certain distance in opposite directions. Then, the second stop 6221 abuts against the next first stop 6211, again limiting the upper pad 21 and the lower pad 22, thereby fixing the distance between the upper pad 21 and the lower pad 22.

[0072] Repeat the above steps to adjust the distance between the upper pad 21 and the lower pad 22 to the appropriate size. Then install the protective cover 213 on the upper pad 21 to complete the adjustment of the height of the tibial pad 2.

[0073] Finally, following the surgical procedure for total knee replacement, the tibial support 1, tibial pad 2, and femoral condyle 3 were implanted into the body to complete the installation of the prosthesis.

[0074] This application also discloses a manufacturing process for a composite ceramic knee joint prosthesis, including the following steps:

[0075] According to the design model, the femoral condyle 3 and tibial support 1 can be made by forging titanium alloy or cobalt chromium molybdenum alloy, or they can be made by 3D printing.

[0076] The fabricated femoral condyle 3 and tibial support 1 cores were machined.

[0077] Vacuum plasma coating 5 is applied to the inner surface of the femoral condyle 3 and tibial support 1. If the femoral condyle 3 and tibial support 1 are fabricated by 3D printing, the 3D printed trabecular bone network on the inner surface of the femoral condyle 3 and tibial support 1 does not need to be sprayed.

[0078] Nano-glaze is applied to the outer surfaces of the femoral condyle 3 and tibial support 1 to form a ceramic coating 4;

[0079] The femoral condyle 3 and tibial support 1 were subjected to vacuum high-temperature sintering at a temperature of 1300°C. 0 C-1500 0 C;

[0080] The femoral condyle 3 and tibial support 1 were subjected to hot isostatic pressing to remove residual pores;

[0081] The ceramic coating 4 surface is polished to achieve a mirror finish;

[0082] Tibial pads 2 were made of highly cross-linked ultra-high molecular weight polyethylene mixed with vitamin E.

[0083] Complete the preparation of the knee joint prosthesis.

[0084] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A composite ceramic knee prosthesis comprising a tibial tray (1), a tibial pad (2) and a femoral condyle (3), the tibial pad (2) being arranged on the tibial tray (1), the femoral condyle (3) being arranged on the tibial pad (2), characterized in that: The femoral condyle (3) and the tibial tray (1) are made of titanium alloy or cobalt-chromium-molybdenum alloy, the surface of the femoral condyle (3) and the tibial tray (1) close to the tibial pad (2) is an outer surface, the outer surface of the femoral condyle (3) and the tibial tray (1) is coated with a ceramic coating (4) respectively, and the tibial pad (2) is made of high-crosslinking ultra-high molecular weight polyethylene mixed with vitamin E. The tibial pad (2) comprises an upper pad sleeve (21) and a lower pad sleeve (22) sleeved on the upper pad sleeve (21), and an adjusting mechanism (6) is arranged between the upper pad sleeve (21) and the lower pad sleeve (22), and the adjusting mechanism (6) is used for adjusting the distance between the upper pad sleeve (21) and the lower pad sleeve (22). A first accommodating groove (212) is formed in the upper pad sleeve (21), and a second accommodating groove (222) is formed in the lower pad sleeve (22), the first accommodating groove (212) and the second accommodating groove (222) are communicated to form an accommodating cavity, the adjusting mechanism (6) comprises an elastic member (61) and a limiting adjusting assembly (62), the elastic member (61) is arranged in the accommodating cavity and abuts against the inner walls of the first accommodating groove (212) and the second accommodating groove (222) respectively, and the elastic member (61) is used for pushing the upper pad sleeve (21) and the lower pad sleeve (22) to move away from each other, and the limiting adjusting assembly (62) is used for limiting the movement of the upper pad sleeve (21) and the lower pad sleeve (22). The limiting adjusting assembly (62) comprises an adjusting sleeve (621) and a limiting rotating rod (622), the adjusting sleeve (621) is fixedly installed in the first accommodating groove (212), a first stop block (6211) is arranged on the inner wall of the adjusting sleeve (621), one end of the limiting rotating rod (622) penetrates the upper pad sleeve (21) and the adjusting sleeve (621) in sequence and is rotationally connected with the lower pad sleeve (22), and a second stop block (6221) is arranged on the circumferential side wall of the limiting rotating rod (622), and the side of the first stop block (6211) close to the upper pad sleeve (21) abuts against the second stop block (6221). A plurality of first stop blocks (6211) are arranged, the plurality of first stop blocks (6211) are uniformly distributed around the axis of the adjusting sleeve (621) and along the length direction of the adjusting sleeve (621), and the second stop block (6221) can abut against different first stop blocks (6211) respectively.

2. The composite ceramic knee prosthesis of claim 1, wherein: The femoral condyle (3) and the tibial tray (1) are formed by 3D printing.

3. The composite ceramic knee prosthesis of claim 1, wherein: The ceramic coating (4) is made of nano-glaze.

4. The composite ceramic knee prosthesis of claim 1, wherein: The surface of the femoral condyle (3) and the tibial tray (1) away from the tibial pad (2) is an inner surface, the inner surface of the femoral condyle (3) and the tibial tray (1) is provided with a vacuum plasma coating (5), and the vacuum plasma coating (5) is made of titanium, titanium and hydroxyapatite composite, or pure tantalum material.

5. The composite ceramic knee prosthesis of claim 1, wherein: A limiting sleeve (63) is arranged on the inner wall of the accommodating cavity, and the elastic member (61) is arranged in the limiting sleeve (63).

6. A process for the production of a composite ceramic knee prosthesis for the production of a composite ceramic knee prosthesis according to any one of claims 1 to 5, characterized in that , comprising the following steps: According to the design model, titanium alloy or cobalt-chromium-molybdenum alloy is used to make femoral condyle (3) and tibial tray (1); High cross-linked ultra-high molecular weight polyethylene mixed with vitamin E is used to make tibial pad (2); The outer surface of femoral condyle (3) and tibial tray (1) is coated with nano-glaze to form ceramic coating (4); Femoral condyle (3) and tibial tray (1) are subjected to vacuum high-temperature sintering treatment respectively; Femoral condyle (3) and tibial tray (1) are subjected to hot isostatic pressing process treatment; The surface of ceramic coating (4) is polished to achieve mirror surface.

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