Abstract: A knee-joint endoprosthesis includes a femoral part having, at the lower end, two condylar pans, and a tibial part having a tibial plateau with upper support areas for supporting, and also for guiding the condylar pans with movements of the knee joint. The condylar pans each have a downwardly-running lateral wall, which, at its convexly-curved lower end passes over into a support surface running transversely outwardly. The condylar pans each have, ventrally at the transition from the lateral wall to the support wall, a recess directed toward inside of the pan, across which an intervening space between the condylar pans is widened such that, with stronger bending, the knee cap can enter into this widened zone of entry of the intervening space.

Abstract: Given is a knee-joint endoprosthesis that displays a femur part with convexly-curved condylar cups, and a tibia part with a tibia plateau insert displaying correspondingly, concavely-curved tip surfaces. A connecting part projects with one end into an intermediate space between the condylar cups, is pivotably connected there with the femur part by means of a transverse bolt, and at the other end has a pin that is rotatably journaled in a boring passing through the tibia plateau. To realize, in the case of this axle knee, a bending movement with additional rolling movement components, the pin of the connecting part is journaled in impact-free, axially-displaceable fashion, and the condylar cups approximate a rotation surface about a condylar cup axis that runs above and parallel to the axis of the transverse bolt.