Shelf acetabuloplasty for Perthes disease in patients older than eight years of age: an observational cohort studyWright, David M.; Perry, Daniel C.; Bruce, Colin E.Journal of Pediatric Orthopaedics B: March 2013 - Volume 22 - Issue 2 - p 96–100 doi: 10.1097/BPB.0b013e32835b5726 Hip & Femur Abstract Author Information This is a retrospective review of 24 patients with late-onset Perthes disease treated with shelf acetabuloplasty. The mean age of the patients was 9.8 years. The medial joint space ratio improved from 1.66 to 1.47 (P<0.05) and the acetabular cover ratio improved from 0.87 to 1.18 (P<0.001). At maturity, five hips were Stulberg II, 13 were Stulberg III and six were Stulberg IV. The study suggests that shelf acetabuloplasty favourably affects long-term Stulberg grading and therefore outcome compared with historic nonoperative treatment regimens. We believe that the procedure deserves further evaluation in any future randomized-controlled trial of the management of late-onset Perthes disease. Alder Hey Children’s Hospital, Eaton Road, Liverpool, UK Correspondence to David M. Wright, FRCS (Tr&Orth), Alder Hey Children’s Hospital, 10 Halsnead Close, Liverpool L15 8GA, UK Tel: +44 780 144 5057; fax: +44 151 252 5921; e-mail: firstname.lastname@example.org © 2013 Lippincott Williams & Wilkins, Inc.