Patent ID: 7470287

Claim:
Shoulder or hip prosthesis comprising a first component, humeral or femoral, presenting a concave surface of articulation and a second, intermediate component presenting first and second convex surfaces of articulation intended to cooperate respectively with the concave surface of articulation of the first component and with a glenoidal or acetabular concave surface of articulation which is natural or defined by a third, glenoidal or acetabular component, the second component being hollow and defining a volume for receiving a part of a member belonging to the first component, the part being connected to a metaphyseal part of the first component by a stem traversing an opening made in a ring of the second component, mounted on a cup of which the outer surface forms the second convex surface of articulation of the second component, wherein the first convex surface of articulation of the second component is formed on the outer surface of the ring, around the opening and wherein the second convex surface of articulation of the second component is unconstrained relative to the concave surface of articulation of the third component.