Level I, prospective randomized controlled trial.

The significance of the quality indicator "Preoperative stay" without division into whether this was administrative or patient-related must be considered critically.

The authors reviewed the results of Dega acetabuloplasty in developmental dysplasia of the hip performed simultaneously with intertrochanteric osteotomy (predominant derotation-varusosteotomy DVO). 74 hips in 55 patients were assessed at a follow-up of 7-17 years (mean 10 years). Measurements of the acetabulum and the head-acetabulum-relation were found to be normal or slightly pathologic in 80-93% of the hips. Values of the femoral head and neck were in the low normal percentage. Poor clinical and radiological outcome was caused by avascular necrosis of the femoral head or revalgisation after DVO. The rate of avascular necrosis after conservative treatment was 23.4%, the rate as a consequence of the operation was 5.4%. Therefore, we prefer at present the subtrochanteric osteotomy of the femur.

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