Fixed plateau type unicompartment knee prosthesis and tibial plateau prosthesis designing method

Abstract

The invention relates to the field of design of medical apparatuses, and in particular to a fixed plateau type unicompartment knee prosthesis, which comprises a femoral condyle prosthesis, a fixed plateau mat and a tibial plateau prosthesis, wherein the cross section of the tibial plateau prosthesis is similar to a semicircle; a clamping groove is formed in the inner wall of the tibial plateau prosthesis; the fixed plateau mat is clamped in the clamping groove; the upper surface of the fixed plateau mat is a fixed plateau mat is a single-radius cambered surface which is relatively low in curvature; the femoral condyle prosthesis is of a single-radius spherical structure; and the femoral condyle prosthesis is placed on the fixed plateau mat. The product (the fixed plateau type unicompartment knee prosthesis) provided by the invention is strong in bearing capacity, and the product can guarantee stability of buckling and prevent injuries and pain of surrounding soft tissues; the designingmethod of the tibial plateau prosthesis comprises steps of CT scanning, data importing and measuring, data analyzing and designing the Chinese people's anatomical tibial plateau prosthesis, so that the designed tibial plateau prosthesis can conform more to a tibial anatomical structure of Chinese people; therefore, a bone coverage rate and bearing capacity of proximal tibia cortical bone to the plateau prosthesis are improved, a risk of fatigue fracture of the plateau prosthesis is reduced and a survival rate of the prosthesis is improved.

Description

technical field [0001] The invention relates to the field of medical device design, in particular to a design method for a fixed-platform unicompartmental knee joint prosthesis and a tibial platform prosthesis. Background technique [0002] The unicompartmental knee prosthesis is used for surface replacement of the unilateral diseased compartment of the knee joint. It not only has a small surgical incision, less osteotomy during the operation, but also does not affect or less affects other normal joint compartments, and does not damage the knee extension. The device can preserve the cruciate ligament and osteocartilage, so the recovery after unicompartmental knee replacement is fast, the complications are few, and the normal motion and proprioception of the knee joint are preserved. [0003] At present, the unicompartmental knee prosthesis is divided into movable platform type and fixed platform type according to the different movement modes; the movable platform type unicom...

AI Technical Summary

Problems solved by technology

At present, the unicompartmental knee joints on the market are mostly designed according to the anatomical shape of Western knee joints. The tibial plateau prosthesis is prone to overhang of the internal and external prosthesis or incomplete coverage of the anterior and posterior bones on the tibial plateau osteotomy surface. Cause soft tissue damage and pain around the knee joint, if the bony coverage is incomplete, it will reduce the bearing capacity of the proximal tibial cortical bone to the platform, which will accelerate the fatigue damage of the platform and reduce the survival rate of the prosthesis

[0005] In addition, in terms of material selection, most of them are forged titanium alloys, which are easy to wear when combined with polyethylene liners, so polyethylene debris is easily produced, causing osteolysis and loosening of the prosthesis

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