Medial femoral single condyle prosthesis, lateral femoral single condyle prosthesis, and femoral trochlea prosthesis

Abstract

The invention discloses a medial femoral single condyle prosthesis (201), a lateral femoral single condyle prosthesis (301), and a femoral trochlea prosthesis (401). The medial femoral single condyle prosthesis comprises an articular surface which is a surface making contact with the medial patella and the medial tibial plateau during the knee joint motion process, wherein the articular surface is presented as a segmental arc (203) on a first ellipse (38) on the sagittal position, and is presented as a segmental arc (95) on a first circle (94) on a coronal position; and an inside surface, which is the part adjoining femoral condyle cut bone surface and bone cement after prosthesis implantation, and is presented as a medial posterior condyle (202) with a straight line section and a medial distal end (209) consistent with the segmental arc (203). The prosthesis can be closer to the geometric shape of the normal human femoral condyle, and design parameter values of femoral prostheses of various types are simplified.

Description

technical field [0001] The present disclosure relates to an artificial knee joint prosthesis, in particular to a unicompartmental replacement prosthesis applied to early knee medial compartment, lateral compartment and patellofemoral osteoarthritis. Background technique [0002] The knee joint is divided into three compartments, the medial, lateral, and patellofemoral compartments. Early knee osteoarthritis (OA) can involve any compartment, but especially the medial compartment of the knee joint. At this time, the line of force of the knee joint is shifted to the inside (varus deformity), resulting in excessive wear of the medial compartment, causing thinning and stripping of the cartilage surface of the medial femoral condyle and the corresponding medial tibial plateau. Typical symptoms of medial compartment OA are varus deformity, pain with articular cross-cords, osteophyte formation, and collateral ligament laxity. Conservative treatment or non-surgical treatment measur...

AI Technical Summary

Problems solved by technology

Although this groove has no clinical evidence to prove that it has an impact on the kinematics of the knee joint or the service life of the prosthesis, in fact this groove is where the most distal end of the femur is located, and its height cannot be restored, resulting in an uncorrectable knee varus deformity

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