Patent ID: 7465319

Claim:
A shoulder or hip prosthesis comprising: a first component having a concave surface of articulation formed by a plate, wherein the plate is connected to a first end of the first component by a neck, wherein the first end of the first component is adapted to be anchored in a medullary cavity; a second component having a concave surface of articulation; and an intermediate component having a first convex surface of articulation and a second convex surface of articulation, wherein the first and second convex surfaces of articulation cooperate respectively with the concave surface of articulation of the first component and with the concave surface of articulation of the second component, and wherein the second convex surface of articulation of the intermediate component is unconstrained relative to the concave surface of articulation of the second component; wherein the intermediate component has a retaining member for retaining the concave surface of articulation of the first component in abutment against the first convex surface of the intermediate component; wherein the retaining member has a non-circular passage in which the neck of the first component is adapted to be displaced as a function of movements of the first component with respect to the second and intermediate components; and wherein the retaining member and the first convex surface of articulation of the intermediate component define a volume for receiving a second end of the plate which projects radially with respect to the neck.