Legg-Calve-Perthes disease (LCPD) is the term used to describe uni- or bilateral avascular necrosis (AVN) of the femoral head in children. The disease is Legg-Calvé-Perthes disease (Orphanet_2380, an Orphanet rare-disease nomenclature term). Also known as: Aseptic necrosis of the capital femoral epiphysis, Osteochondritis of the capital femoral epiphysis, Osteochondrosis of the capital femoral epiphysis, Perthes disease.