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Osteonecrosis of the femoral head

aseptic or avascular necrosis of the femoral head

Pronunciation
/ˌɒstɪəʊnɛˈkrəʊsɪs əv ðɪ ˈfɛmərəl hɛd/
/ˌɑstioʊnɪˈkroʊsɪs əv ðə ˈfɛmərəl hɛd/