Patent ID: 7749277

Claim:
A containment system comprising: (a) a shell, the shell comprising a cavity and an outside surface and including at least one opening on the outside surface providing access to the cavity; (b) a liner, the liner comprising: an outer surface; a lip; and an inner surface, the inner surface forming a cavity and including a web, wherein the web extends around a portion of the lip and forms a D-shaped opening; (c) an implant stem head, the implant stem head comprising: a generally spherical body having a surface configured to correspond to the web enabling the implant stem head to be inserted into the liner when the implant stem head is in a first orientation; and a cavity; and (d) a separate femoral stem component which may be inserted into the cavity of the implant stem head, wherein the shell may be received by an acetabulum, and wherein the liner may be received in the cavity of the shell, and wherein after the implant stem head is inserted into the cavity of the liner, rotated within the liner, and the femoral stem component inserted into the cavity of the implant stem head, the implant stem head may articulate within the liner but cannot be removed from the liner.