This study was aimed to evaluate the usefulness of the dual approaches used in Bernese periacetabular osteotomy for hip dysplasias, and also to comparatively evaluate the single anterior approach.

We performed a clinical and radiographic assessment of 15 cases (5 cases by the anterior approach and 10 cases by the dual approaches) of periacetabular osteotomy which had been followed up for more than 1 year.

All patients had an improved Harris hip score, CE angle, acetabular angle, acetabular depth, femoral head coverage and medial shift of the femoral head. Gait improvement was confirmed by gait analysis. The mount of correction of the CE angle was more by the anterior approach than by the dual approaches, which was due to overcorrection. There were no statistical differences in the operation times or in the amounts of bleeding of the two approaches. Posterior column fractures occurred in 4 hips, which were due to blind osteotomies by the single approach, but none occurred after the dual approaches.

We visualized all osteotomy sites and could perform the osteotomies easily and were able to decrease the number of complications associated with the dual approaches.