Patent ID: 7938862

Claim:
An artificial joint as an endoprosthesis for a human joint, comprising: a first joint part having two first functional surfaces; a second joint part having two second functional surfaces, the two first and second functional surfaces of each joint part being convex-concave, concave-convex, or convex-convex in a proximal-distal direction; a projection associated with the first joint part; and a recess associated with the second joint part and configured to engage with the projection so as to determine a relative position of the first and second joint parts in a transverse plane of the joint depending on an angular position of the first and second joint parts, wherein the two first functional surfaces are pivotable about a pivot axis with respect to the second functional surfaces, wherein each of the first functional surfaces rolls and slides with respect to the second functional surfaces during an extension or flexion of the artificial joint, wherein the projection and recess form a posterior stop having a position depending on a flexion angle of the joint and configured to delimit or prevent a posterior sliding movement of at least one of the first and the second joint parts, and wherein the recess and the projection each include a width that decreases in a posterior direction in the transverse plane.