Abstract: A prosthetic joint acetabular cup component is provided that can be press fit into a patient's acetabulum, to create an interference fit and to eliminate the need for cement. A body portion of the cup provides an outer convex surface, The inside of the cup provides an inner concave surface. An apex portion of the cup or shell is spaced from the lower rim portion, the lower rim defining a plane. A plurality of annular rings are spaced along the body outer surface beginning at the lower rim and extending at least a partial distance toward the apex. Each of the annular rings is preferably generally parallel to the plane of the lower rim.