Abstract: A hip joint socket includes a plastic socket member and an outer metallic ring member laterally closely enclosing the socket member. The socket member has a conically shaped outer surface in closely fitting engagement with a corresponding conically shaped inner surface on the ring member. Outwardly projecting parts on the socket member fit in a dovetail fashion in corresponding recesses formed in the ring member. The socket is self-fixing within the ring member during any cold flow of its plastic material so that relative movement between the socket member and the ring member is prevented.