An acetabular cup assembly prosthesis comprises the combination of a support shell for introduction into an acetabulum and a socket insert in nesting engagement within the shell. The shell has a generally hemispherical outer surface and a downwardly extending concavity surrounded by a peripheral rim, At least one anchoring post secures the shell to the acetabulum, and a central opening in the bottom of the concavity serves as a connection location for the socket insert. The insert has a hemispherical concavity that articulates with the rounded head of a femoral prosthesis, while the outer surface of the insert nests within the concavity of the support shell. A central fastening tab extends from the insert into locking engagement with the opening in the support shell, and structure is provided to prevent relative rotation of the shell and insert.
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