title: [Total hip arthroplasty for Crowe type-IV development dysplasia of hip in adults].
abstract: OBJECTIVE
  To determine the operation procedure of total hip arthroplasty (THA) for Crowe type-IV developmental dysplasia of hip and its relationship with nerve injury.
  
  
  METHODS
  A consecutive series of 39 THAs was performed for Crowe type-IV developmental dysplasia of hip in 35 patients (all female). The mean age of the patients at the time of surgery was 46 years (range 36 - 56 years). Thirty-five hips in 31 patients were followed up. The average follow-up period of the whole series was 4 years (range 1 - 8 years). All procedures were carried out through a lateral-posterior approach. In 33 of 35 hips, the cup was inserted in the "true" acetabulum. All the prostheses used were cementless, except for 5 cemented femoral stems in 5 patients. Each patient was evaluated clinically and by radiographs before the operation and during the follow-up period, according to the Harris hip score (HHS).
  
  
  RESULTS
  None of the cups and stems were revised for aseptic loosening, dislocation or infection during the follow-up period. The mean preoperative HHS was 43 compared with the postoperative HHS of 87. The mean amount of postoperative leg lengthening was 5 cm (range 4 - 6 cm).
  
  
  CONCLUSIONS
  The reconstruction of the hip at the level of the "true" acetabulum through a lateral-posterior approach is a safe and effective procedure of THA for Crowe type-IV developmental dysplasia of hip in adults. Acute leg lengthening of less than 6 cm could not cause nerve injury.
authors.affiliation: Department of Orthopaedics, the Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200011, China. zhuzhenan2006@126.com
authors.forename: Zhen-an
authors.initials: ZA
authors.lastname: Zhu
authors.forename: Ke-rong
authors.initials: KR
authors.lastname: Dai
authors.forename: You
authors.initials: Y
authors.lastname: Wang
authors.forename: Yue-hua
authors.initials: YH
authors.lastname: Sun
authors.forename: Ding-wei
authors.initials: DW
authors.lastname: Shi
authors.forename: Jian
authors.initials: J
authors.lastname: Tang
authors.forename: Yong-qiang
authors.initials: YQ
authors.lastname: Hao
authors.forename: Meng-ning
authors.initials: MN
authors.lastname: Yan
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006618:Hip Dislocation, Congenital / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D016896:Treatment Outcome