An acetabular hip implant includes an acetabular shell component (26) having a first feature (70-75) and a first insert (28) having a second feature (94-99) that cooperates with the first feature of the acetabular shell component and further includes a third feature (112-116). The implant further includes a second insert (30) having a fourth feature (124-129) that cooperates with the third feature of the first insert and further includes a fifth feature (142). A femoral head component (132) includes a sixth feature (164) that cooperates with the fifth feature. Interaction between the first and second features, between the third and fourth features, and between the fifth and sixth features mechanically constrains the acetabular hip implant to prevent dislocation of the femoral head during rotation.
