Fig. 1

Preoperative radiograph and post-operative correction of a 22 years old woman with bilateral hip dysplasia. She was treated by Bernese PAO using the double-incision approach. A, B Preoperative radiographs of pelvis, showing bilateral acetabular dysplasia. C, D Postoperative anteroposterior pelvic radiograph and false-profile radiograph of the left hip at 2 months. E, F Preoperative radiographs of the right hip. G, H Postoperative anteroposterior pelvic radiograph and false-profile radiograph at 1 year (left hip) and 6 months (right hip)