Patent ID: 7115145

Claim:
An acetabular prosthesis, comprising: an acetabular shell; an acetabular articulating component having a partial spherical shape with an inner surface forming a partial spherical cavity adapted to receive a femoral ball, the articulating component being connectable to the shell; and an acetabular constraining component connectable to the articulating component and having a ring shape body with two extensions extending outwardly from the body, the extensions having a triangular cross section, wherein said acetabular articulating component further comprises a plurality of extensions, each of which comprise a stepped outer surface, and wherein each of said extensions of said acetabular constraining component further comprise: an outer surface that slopes inwardly toward a center of the body; two end walls that are sloped and form an obtuse angle with the body; and a stepped inner surface comprised of three vertical surfaces and two horizontal surfaces that defines a stepped configuration on said inner surface, said stepped inner surface being adapted to mate with said stepped outer surface.