Yasunaga Y, et al. - Researchers quantified 37 hips to study the long-term consequences of the rotational acetabular osteotomy (RAO) for symptomatic hip dysplasia in candidates of age less than 21 years at the time of surgery. A significant improvement in the mean Merle d'Aubigne clinical score from 15.4 to 17.2 was recorded. They found improvement as follows: the mean center-edge (CE) angle, from -2.6° to 26°; the mean acetabular roof angle, from 3.0° to 5.2°; and the mean head lateralization index, from 0.68 to 0.62. They also reported the progress in radiological osteoarthritis (OA) in 7 hips, although no individual underwent total hip arthroplasty. They concluded RAO a valid form of correction for a seriously dysplastic hip in adolescent and young adult subjects.