Patent ID: 7303585

Claim:
An endoprosthesis for a shoulder joint, with a joint socket for anchoring in the shoulder blade glenoid or for pivotal co-operation with the natural glenoid, comprising: a shaft piece with a shank and a metaphysal shaft head configured for insertion into a humerus; a neck piece articulated with an articulation member to the shaft head and comprising an axial joint neck adapted to be aligned with the neck piece and to receive a head cap; fixing means for fixing the neck piece in a selected alignment; and a head cap for articulation with the joint socket or the natural glenoid, wherein the articulation member has an articulation surface which is only axially symmetrical and the axis of symmetry of which is perpendicular to a joint neck axis, and wherein the articulation surface co-operates with at least one clamping surface on the shaft piece, said clamping surface being substantially rotationally symmetrical to a rotational axis and/or being substantially planar and perpendicular to the rotational axis, the rotational axis being perpendicular to the axis of symmetry of the articulation surface.