SLOB

If it is from a too shallow cup then OK. Displacement of the ball center from the cup center is impossible unless the acetabular walls are breached, pushed out allowing the ball sideways sliding. The plan is to first reduce the asymmetrical forces. SPML is done as is ethanol nerve things, but SLOB adds recession of the rectus femoris from the pelvis and letting it be like the rest of the quadriceps of which it is part. The iliopsoas is also lengthened (intra pelvic). The flattened region of socket is reshaped and bone wedges hold that. A big blob of bone marrow /matrix/BMP is molded into place turning the yarmulke hip socket into a football helmet.