High Quality Content by WIKIPEDIA articles! Legg-Calvé-Perthes syndrome is a degenerative disease of the hip joint, where growth/loss of bone mass leads to some degree of collapse of the hip joint and to deformity of the ball of the femur and the surface of the hip socket. The disease is characterized by idiopathic avascular osteonecrosis of the capital femoral epiphysis of the femoral head leading to an interruption of the blood supply of the head of the femur close to the hip joint. The disease is typically found in young children, and it can lead to osteoarthritis in adults. The effects of the disease can sometimes continue into adulthood. It is also known more simply as Perthes disease, ischemic necrosis of the hip, coxa plana, osteochondritis and avascular necrosis of the femoral head, Legg-Perthes Disease or Legg-Calve-Perthes Disease (LCPD).