We treated 42 hips with symptomatic acetabular dysplasia using triple pelvic osteotomy. The mean age of the patients was 20.7 years (12-47). The median follow-up was 50.3 months. The average Harris hip score improved from 74 to 92 points. Significant improvement from the preoperative to the latest follow-up evaluation was seen radiologically with reference to the center-edge angle, the anterior center edge angle, the acetabular index and the femoral head extrusion index. Shenton's line was intact in 9 hips before the operation and it was intact in 40 hips at the latest follow-up. The cross-over sign was present in 15 hips before the operation and it was present in one hip after the operation. The results of this study demonstrated that triple pelvic osteotomy provides improved radiographic results and good symptomatic relief in acetabular dysplasia.