The prognosis of this disease is related to the age of onset, gender and type of lesion. In general, the younger the age of onset, the better the prognosis, because the younger the age, the greater the potential for development and shaping, even to the point of developing a completely normal joint. Catterall’s grade I and II have a better prognosis than grade III and IV, and can be cured without significant deformity, even with bed rest and bracing alone. The following factors are considered to have a poor prognosis: (1) age over 6 years; (2) obese children; (3) progressive limitation of hip movement; (4) spasm of the adductor muscle; (5) lateral epiphyseal ossification defect on X-ray; (6) diffuse epiphyseal reaction; (7) lateral subluxation of the femoral head; and (8) horizontal position of the epiphyseal plate. The above clinical signs are mostly seen in Catastrophic Grade III and IV. Of course, a reasonable clinical treatment can have a significant impact on the prognosis.