Patent ID: 8308811

Claim:
An acetabular prosthesis comprising: a shell component having a convex external surface shaped for engagement with an acetabulum and a concave interior surface defining an internal cavity, said interior surface including an annular groove; a first bearing component having a convex external surface and a concave internal surface, said external surface of said first bearing component defining an annular projection configured for receipt within said annular groove of said shell component in mating snap-fit engagement; a conversion ring having a sidewall defining an outer surface and a tapered inner surface, said sidewall extending axially from a first end to a second end, said outer surface defining an annular projection configured for receipt within said annular groove of said shell component in mating snap-fit engagement; and a second bearing component having a tapered external surface and a concave internal surface, said external surface of said second bearing component configured to releasably engage said tapered inner surface of said conversion ring in mating taper-fit engagement, wherein said projection of said conversion ring further comprises a ramped leading edge, a seating portion, and a shoulder, said seating portion extending substantially parallel to said outer surface of said conversion ring, and an angle α extending between said leading edge of said conversion ring and said first end of said conversion ring, said angle α being greater than or equal to 20 degrees and less than or equal to 30 degrees.