An artificial joint as an endoprosthesis for a human joint, including 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. The recess is 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 and to form a stop for a sliding movement of the first and second joint parts relative to each other. The two first functional surfaces are pivotable about a pivot axis with respect to the second functional surfaces and 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. A respective posterior position in each angular position is determined as a function of the extension/flexion of the first and second joint parts so as to at least partially delimit a posterior sliding movement of first joint relative to the second joint part.