Patient specificity knee articulation prosthesis

Abstract

The invention provides a patient specificity knee articulation prosthesis. The patient specificity knee articulation prosthesis is used for a total knee articulation replacement operation to replace an impaired articulation surface and recover normal articulation motion. The patient specificity knee articulation prosthesis comprises a thighbone condyle arranged on the thighbone of a patient and atibia pad which is matched with the thighbone condyle, wherein the thighbone condyle is provided with a thighbone trochlea which is matched with a patella prosthesis, the thighbone trochlea is provided with a patella articulation surface, and the patella articulation surface on the coronal plane is constituted by multiple hook faces with different curvatures. The patella articulation surface has acurvature radius which has the tendency of firstly decreasing along with increasing of the articulation flexion angle and then maintaining unchanged on the coronal plane, an included angle which is constituted by hook face tangent lines and has the tendency of firstly decreasing along with increasing of the articulation flexion angle and then maintaining unchanged, and a depth which is increasedalong with increasing of the articulation flexion angle. The thighbone trochlea of the thighbone condyle can be in continuous and stable contact with the patella prosthesis, the situation that the patella prosthesis is separated from the thighbone condyle while conducting articulation high-flexion motion is avoided, and the stability of the patient specificity knee articulation prosthesis is improved.

Description

【Technical field】 [0001] The present invention relates to the technical field of orthopedic medical devices, in particular to a patient-specific knee joint for replacing damaged articular surfaces, restoring normal motion of joints, and avoiding dislocation or aggravated wear due to stress concentration during joint high flexion movements Prosthesis. 【technical background】 [0002] Joint replacement is a method of treating joint diseases that replaces painful and lost joint functions with artificial joints. Knee prostheses commonly used to replace the damaged articular surface in total knee arthroplasty to restore joint motion include the femoral condyle assembled on the femur, the patellar prosthesis assembled on the patella and matched with the femoral condyle, the assembled knee prosthesis The tibial component rests on the tibia and the tibial pad sits between the femoral condyles and the tibial component. [0003] The femoral condyle includes a pair of medial condyle a...

AI Technical Summary

Problems solved by technology

[0005] The knee joint prosthesis replaces the damaged articular surface and restores joint motion during joint flexion through the cooperation of the femoral articular surface of the femoral condyle and the tibial articular surface of the tibial pad, and the cooperation of the patellar articular surface of the femoral condyle and the patella prosthesis. function, but because the femoral trochlear depth of the femoral condyle of the existing knee prosthesis is shallow, it will cause dislocation of the patella when the knee prosthesis is in high flexion motion; and the patellar articular surface of the femoral condyle is usually set with the same curvature Yes, it cannot fully match the curved surface of the patella prosthesis, which will aggravate the wear of the patella prosthesis

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