Fig. 2

A Preoperative radiograph of the hip of a 43-year-old male with residual poliomyelitis,showing a osteoarthritis secondary to developmental dysplasia of the hip. B Postoperative radiograph. CRadiograph obtained 1 month after surgery showed dislocation of the hip. D Radiograph obtained after the manual replacement on the dislocation of the hip. E At 5.4-year follow-up,radiograph showed a classII heterotopic ossification(Brooker classification system),no evidence of implant subsidence, implant loosening or osteolysis, no dislocation recurred