Rotational acetabular osteotomy for symptomatic hip dysplasia in patients younger than 21 years of age SEVEN- TO 30-YEAR SURVIVAL OUTCOMES

Aims The aim of this study was to report the long-term results of rotational acetabular osteotomy (RAO) for symptomatic hip dysplasia in patients aged younger than 21 years at the time of surgery. Patients and Methods We evaluated 31 patients (37 hips) aged younger than 21 years at the time of surgery retrospectively. There were 29 female and two male patients. Their mean age at the time of surgery was 17.4 years (12 to 21). The mean follow-up was 17.9 years (7 to 30). The RAO was combined with a varus or valgus femoral osteotomy or a greater trochanteric displacement in eight hips, as instability or congruence of the hip could not be corrected adequately using RAO alone. Results The mean Merle d'Aubigne clinical score improved significantly from 15.4 to 17.2 (p < 0.0001). The mean centre-edge (CE) angle improved from -2.6 degrees to 26 degrees, the mean acetabular roof angle improved from 3.0 degrees to 5.2 degrees, and the mean head lateralization index improved from 0.68 to 0.62. Progression of radiological osteoarthritis (OA) was seen in seven hips, but no patient underwent total hip arthroplasty. Conclusion RAO is an effective form of correction for a severely dysplastic hip in adolescent and young adult patients.