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a A preoperative anteroposterior (AP) radiograph of the left hip of a 25 year-old woman shows Perthes-like deformities of class III. b A preoperative AP radiograph of the left hip in the abducted position showing the widening of the join space. c A postoperative AP radiograph of the left hip, taken 5 years postoperatively. The progression of osteoarthritis has not been recognised at the time of writing
