Over time, healing occurs by new blood vessels infiltrating the dead bone and removing the necrotic bone which leads to a loss of bone mass and a weakening of the femoral head. The bone loss leads to some degree of collapse and deformity of the femoral head and sometimes secondary changes to the shape of the hip socket. It is also referred to as idiopathic avascular osteonecrosis of the capital femoral epiphysis of the femoral head since the cause of the interruption of the blood supply of the head of the femur in the hip joint is unknown.Perthes can produce a permanent deformity of the femoral head, which increases the risk of developing osteoarthritis in adults.<unk>  is a form of osteochondritis which only affects the hip, although other forms of osteochondritis can affect elbows, knees, ankles, and feet. Bilateral<unk> , which means both hips are affected, should always be investigated thoroughly to rule out multiple epiphyseal dysplasia.
Legg–Calvé–Perthes disease
Langer–Giedion syndrome
Osgood–Schlatter disease
Avascular necrosis
Iliotibial band syndrome
Löfgren syndrome
Patellar subluxation syndrome
Boxer's fracture