Tönnis triple pelvic osteotomy for the management of late residual acetabular dysplasia mid-term to long-term follow-up study of 54 patientsFarsetti, Pasquale; Caterini, Roberto; De Maio, Fernando; Potenza, Vito; Efremov, Kristian; Ippolito, ErnestoJournal of Pediatric Orthopaedics B: May 2019 - Volume 28 - Issue 3 - p 202–206 doi: 10.1097/BPB.0000000000000575 PEDIATRIC ORTHOPAEDICS IN ITALY: SPECIAL ISSUE Buy SDC Abstract Author InformationAuthors Article MetricsMetrics The authors reviewed 54 (58 hips) patients with acetabular dysplasia following developmental dislocation of the hip (DDH), treated by triple pelvic osteotomy according to the Tönnis technique. The aim of our study was to report the long-term clinical and radiographic results of the operation at a mean follow-up of 12 years (from 7 to 20). At diagnosis, all the hips were painful, the Wiberg angle measured less than 20°, and no radiographic signs of osteoarthritis were present. At follow-up, 82.7% of the operated hips showed either excellent or good results, according to Harris, and the Wiberg angle measured an average of 34° (from 26° to 45°). We encountered five complications: one acetabular malrotation and four asymptomatic ischial nonunions. In conclusion, we believe that, although Bernese periacetabular osteotomy is nowadays considered the gold standard for the surgical treatment of the dysplastic hip following DDH, Tönnis osteotomy represents a good treatment option: it is technically easy, enables direct visualization of the three osteotomies, leads to few complications, and its learning curve is short. The absence of radiographic signs of osteoarthritis and hip congruency before surgery are the basic requirements to achieve a successful result. Department of Orthopaedic Surgery, University of Rome ‘Tor Vergata’, Rome, Italy Correspondence to Pasquale Farsetti, MD, Department of Orthopaedic Surgery, University of Rome ‘Tor Vergata’, Viale Oxford, 81 00133 Rome, Italy Tel: +39 335 532 1530; fax: +39 062 090 3847; e-mail: email@example.com Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.