Fig. 2.

Female, 14 months old, open reduction for DDH in the left hip a Preoperative anteroposterior pelvic radiograph; b Intraoperative arthrogram after closed reduction with widened medial joint space; c Intraoperative arthrogram after open reduction; d Postoperative MRI during 48 h, the superior and medial joint space were 3.98 mm and 2.05 mm, respectively. e Anteroposterior pelvic radiograph 41 months after surgery; the shape and size of the femoral head were larger than that of the contralateral side; left acetabular index is 29°; right acetabular index is 19°; left alsberg angle is 88°; right alsberg angle is 79°