title: [Total hip arthroplasty for patients with osteoarthritis secondary to hip developmental dysplasia].
abstract: OBJECTIVE
  To investigate the methods of restoring normal level of rotation center of the hip and limb length in patients with osteoarthritis (OA) secondary to developmental dysplasia of the hip (DDH) using total hip arthroplasty (THA).
  
  
  METHODS
  From January 2000 to January 2003, total hip arthroplasties were performed for 21 patients (26 hips) with OA secondary to DDH. There were 19 females and 2 males with an average age of 51 years (range from 40 to 66 years). Based on radiographic classification of Crowe, there were 12 in type I, 5 in type II, 2 in type III and IV respectively. In addition to the standard procedure of THA, the methods of restoring normal level of rotating center of the hip included structural bone autografting and medialization of the cup. The methods of limb length restoration included carefully preoperative planning and intraoperative soft tissue release. During the follow-up period at 3, 6, 12 months postoperatively and then annually thereafter, rotation center of the hip and limb length were assessed radiographically. Harris score system (HSS) was used for clinical evaluation.
  
  
  RESULTS
  All the patients were followed up for a mean time of 26.4 months (range from 12 to 48 months). All the patients had restoration of the normal level of rotation center of the hip. At the latest follow-up, Harris score was improved from preoperative 35 points (range from 12 to 68 points) to postoperative 94 points (range from 74 to 100 points).
  
  
  CONCLUSIONS
  In addition to standard procedure, the restoration of normal level of rotation center of the hip could be achieved by structural bone autografting and medialization of the cup in THA for patients with DDH. Careful preoperative planning and intraoperative soft tissue release could restore limb length.
authors.affiliation: Department of Orthopedic, Peking Union Medical College Hospital, Beijing 100730, China. li_j_wpumc@yahoo.com.cn
authors.forename: Jun-Wei
authors.initials: JW
authors.lastname: Li
authors.forename: Gui-Xing
authors.initials: GX
authors.lastname: Qiu
authors.forename: Xi-Sheng
authors.initials: XS
authors.lastname: Weng
authors.forename: Jin
authors.initials: J
authors.lastname: Jin
authors.forename: Jin
authors.initials: J
authors.lastname: Lin
authors.forename: Hong
authors.initials: H
authors.lastname: Zhao
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006618:Hip Dislocation, Congenital / Q000150:complications / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000209:etiology / Q000601:surgery*; D016896:Treatment Outcome