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a A 32-year-old patient (no. 4/5) with bilateral, steroid-induced avascular necrosis of the femoral head. Note the collapsed left femoral head with beginning erosion of the acetabulum. b One year after a two-staged total hip arthroplasty (THA) with cemented lateralised Müller straight stem and ARRH. c X-ray at the latest follow-up 11 years after THA. No signs of loosening can be observed. Clinically, a Merle-d’Aubigne score of 16 (left) and 17 (right) was achieved
