Knee prosthesis

Abstract

The invention relates to a knee prosthesis, the knee prosthesis comprises a tibial prosthesis and a femoral prosthesis, the tibial prosthesis comprises a tibial articular surface and a stand column arranged on the tibia articular surface which are used for replacing a damaged tibia, the femoral prosthesis comprises an inner condylar articular surface, an outer condylar articular surface and a cam, a space is arranged between the inner condylar articular surface and the outer condylar articular surface, and the cam is connected with the inner condylar articular surface and the outer condylar articular surface. As shown in the figure, the section of the cam on the sagittal plane forms a first straight line segment and an oblique line segment which are matched with the stand column, an included angle is formed between the first straight line segment and the oblique line segment, a first fillet is connected between the first straight line segment and the oblique line segment, and a second fillet is connected to the end, away from the first fillet, of the oblique line segment. According to the knee prosthesis, the probability of dislocation and malposition of the tibial prosthesis and the femoral prosthesis is reduced, the stability of the knee prosthesis is improved, and the revision rate of the knee prosthesis is reduced.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a knee joint prosthesis. Background technique [0002] Total knee replacement surgery has matured as surgical techniques have improved and knee prostheses have improved. Total knee replacement is an effective treatment for advanced arthritis. Posterior-stabilized knee prosthesis is an important part of total knee replacement surgery. According to statistics, the replacement volume of posterior-stabilized knee prosthesis accounts for 10% of total knee replacement. about half of. [0003] When replacing a posterior stabilized knee prosthesis, the anterior and posterior cruciate ligaments of the knee need to be resected. In the design of traditional posterior stabilized knee prosthesis, the function of the posterior cruciate ligament is usually replaced by a cam and column structure, so as to achieve the purpose of guiding the "rolling motion" of the knee joint and maintai...

AI Technical Summary

Problems solved by technology

However, the traditional post-stabilized prosthesis is prone to dislocation or loosening failure during the flexion process, especially when the flexion is high

And traditional posterior stabilized prostheses cannot restore the natural motion of the knee joint well

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