Subtrochanteric femoral shortening osteotomy. A, Bilateral high congenital dislocations and progressive pain in 35-year-old woman. B, After bilateral, staged, total hip arthroplasties. Both sides were lengthened about 3 cm despite removal of 6-cm segment of femur. Femoral osteotomies (arrows) united uneventfully by 3 months with modular, fluted femoral components.