[Remodeling of the hip joint with avascular necrosis during nonoperative treatment of congenital dysplasia, subluxation or dislocation].

Radiological analysis of 61 hips in 32 children served to present natural history of the nonoperatively managed dysplastic hip affected with avascular necrosis of the proximal femur that appeared during treatment. An attempt to establish relationship between the degree of avascular necrosis and radiological state of the hip after growth termination has been made. Ossification disturbances within the femoral neck of some hips and its prognostic value for proximal femur deformity have been assessed. The final radiological assessment revealed 18 per cent excellent results, 34.4 per cent good, 31.2 per cent fair and 16.4 per cent poor results. In hips with changes limited to the femoral head fair and poor results combined constituted less then 25 per cent. If the femoral neck was also involved the percentage amounted to 71. The results accomplished allowed for creating an own prognostic classification of avascular necrosis of the hip.