Abstract: System to produce a knee-joint endoprosthesis with joint elements (10) are constructed to be attached to the lower end of the femur, and have a convexly curved joint bearing surface. Bearing elements (12) are constructed to be attached to the upper end of the tibia (11). A meniscus (14) is movably disposed between each femoral joint element (10) and tibial bearing element (12) and are provided on its upper and lower sides with sliding surfaces complementary in shape to the associated joint bearing surface of the femoral joint element (10) and the associated bearing surface of the tibial bearing element (12), respectively. The peripheral or sagittally outer boundary (16) of the sliding surfaces (15) of the menisci (14) that face the femoral joint elements (10) is higher than their central or sagittally inner boundary. The system is designed for modular, universally compatible supplementation to form a total knee prosthesis, revision prosthesis or femoropatellar joint prosthesis.

Abstract: Knee-joint endoprosthesis with a femoral part (10), a tibial part (11), and a bearing element (12) made of plastic, in particular polyethylene, disposed between the femoral and tibial parts, wherein the bearing element (12) is slidably supported on a spherically concave bearing surface (20) of the tibial part (11), which faces the femoral part (10). Above the tibial bearing surface (20) projects a peglike or rodlike stopping device (21), which enters an elongated opening (22) in the supporting and sliding surface (32) of the bearing element (12) that faces the tibial bearing surface (20), in such a way that the bearing element (12) can rotate on the tibial bearing surface (20) and also, to a limited degree, be displaced longitudinally in the plane of knee flexion.