Irreducible posterior fracture-dislocations of the hip. The role of the iliofemoral ligament and the rectus femoris muscle

Experience with six irreducible fracture-dislocations of the hip suggests an important role for the iliofemoral ligament and the rectus femoris muscle. In posterosuperior dislocations, the acetabular fragment is held by the attached ligament and tendon in an interposed position. Restoration of normal joint anatomy requires open reduction and rotation of the acetabular fragment on its thick soft tissue pedicle over the femoral head and neck.