Knee joint prosthesis capable of being matched with diseased knee joint

Abstract

The invention discloses a knee joint prosthesis capable of being matched with a diseased knee joint. The knee joint prosthesis capable of being matched with the diseased knee joint comprises a femoral condyle (1), a platform mat and a platform holder. The platform mat comprises an inner condyle (2) and an outer condyle (3) which are arranged on the two sides respectively. The inner condyle and the outer condyle are integrally formed to form the platform mat. The thickness of an inner condyle platform mat body is larger than that of an outer condyle platform mat body so that the knee joint can move to perform outwards-turning movement. According to the knee joint prosthesis capable of being matched with the diseased knee joint, the knee joint can physiologically turn outwards by 6 degrees or so during movement. The individually-designed prosthesis is adopted, the platform mat can have an extremely high joint face shape suitability degree, mechanical stress of a joint face can be distributed on a larger area, the proportion of contact stress is reduced, and excessive abrasion of the platform mat is avoided; a fermoral prosthesis in the knee joint prosthesis and the platform mat are good in geometrical shape match, and therefore abnormal movement is obviously reduced, and the knee joint prosthesis can have more superior knee joint dynamics.

Description

technical field [0001] The invention relates to a medical prosthesis, in particular to a knee prosthesis which can make the knee joint move normally and can match the patient's knee joint. Background technique [0002] Knee joint prosthesis is a surgical implant that replaces the knee joint and is used for knee replacement surgery on the surface of the knee joint. The existing knee joint prosthesis structure is mainly composed of press-fit structures, including femoral condyles, platform pads and platforms Support, wherein, the material of femoral condyle and platform support is cobalt-chromium-molybdenum alloy, and the material of platform pad is ultra-high molecular weight polyethylene, such as figure 1 As shown, the platform support and the platform pad are press-fit and locked, and the front part of the platform pad is provided with a transverse groove, which is convenient for the locking part to retract when the platform support and the platform pad are installed. [0...

AI Technical Summary

Problems solved by technology

[0003] Although the above-mentioned knee joint can replace part of the articular surface of the femur and tibia of the knee joint, it is indeed progressive, but in actual use, it is found that there are still some shortcomings in its structure, resulting in that the knee joint cannot be achieved in practical application. The best use effect, and its disadvantages can be summarized as follows:

[0004] 1) Many studies have shown that there are abnormal knee joint movement patterns in various fixed-platform knee replacements. After total knee arthroplasty with preserved posterior cruciate ligament and low form fit, the tibiofemoral contact position is in the normal position when the knee joint is straightened Later, while in flexion it moves anteriorly. This paradoxical movement of the femur relative to the tibia is mainly determined by the geometry of the prosthesis and the tension of the ligaments. This abnormal movement leads to rapid failure of the polyethylene liner.

[0005] 2) The platform pad and the platform bracket need to be installed with a lot of thrust to be installed in place. Through the force transmission, there may be gaps in the bone cement between the platform bracket and the tibial section

[0006] Existing platform design prostheses still suffer from the contradiction between low contact stress and free rotation. Since the fixed platform prosthesis design must have a slight geometric mismatch, the abnormalities that appear in low restriction prostheses The kinetic deviation still exists, but it needs to be further improved

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