Patent ID: 7108719

Claim:
A joint prosthesis comprising: an artificial joint socket for anchoring in a first bone or for pivotal co-operation with a natural joint socket in the first bone; an axial base piece for anchoring in a second bone; an articulation head articulated on the axial base piece and forming, together with a collar extension disposed thereon and defining a collar axis, a collar piece which is pivotable and rotatable relative to the base piece about at least two axes passing through the articulation head and perpendicular to one another; a head cap disposed on the collar extension and co-operating as a joint with the joint socket; at least one pressure piece for pressing the articulation head against the base piece; and means for connecting the pressure piece and the base piece so that the collar extension is lockable in a desired selected rotary position and angular position to the axis of the base piece, between the pressure piece and the base piece, wherein the pressure piece comprises a pressure disc with a passage opening for the collar extension.