title: Cementless arthroplasty with a distal femoral shortening for the treatment of Crowe type IV developmental hip dysplasia.
abstract: BACKGROUND
  Severe developmental dysplasia of the hip is a surgical challenge. The purpose of this study is to describe the cementless arthroplasty with a distal femoral shortening osteotomy for Crowe type IV developmental hip dysplasia and to report the results of this technique.
  
  
  METHODS
  12 patients (2 male and 10 female) of Crowe type IV developmental hip dysplasia operated between January 2005 and December 2010 were included in the study. All had undergone cementless arthroplasty with a distal femoral shortening osteotomy. Acetabular cup was placed at the level of the anatomical position in all the hips. The clinical outcomes were assessed and radiographs were reviewed to evaluate treatment effects.
  
  
  RESULTS
  The mean followup for the 12 hips was 52 months (range 36-82 months). The mean Harris hip score improved from 41 points (range 28-54) preoperatively to 85 points (range 79-92) at the final followup. The mean length of bone removed was 30 mm (range 25-40 mm). All the osteotomies healed in a mean time of 13 weeks (range 10-16 weeks). There were no neurovascular injuries, pulmonary embolism or no infections.
  
  
  CONCLUSIONS
  Our study suggests that cementless arthroplasty with a distal femoral shortening is a safe and effective procedure for severe developmental dysplasia of the hip.
authors.affiliation: Department of Orthopaedics, The Affiliated Southeast Hospital of Xiamen University, Orthopaedic Center of the People's Liberation Army, Zhangzhou 363000, China.
authors.forename: Chang-Yong
authors.initials: CY
authors.lastname: Guo
authors.affiliation: Department of Orthopaedics, The Affiliated Southeast Hospital of Xiamen University, Orthopaedic Center of the People's Liberation Army, Zhangzhou 363000, China.
authors.forename: Bo-Wei
authors.initials: BW
authors.lastname: Liang
authors.affiliation: Department of Orthopaedics, The Affiliated Southeast Hospital of Xiamen University, Orthopaedic Center of the People's Liberation Army, Zhangzhou 363000, China.
authors.forename: Mo
authors.initials: M
authors.lastname: Sha
authors.affiliation: Department of Orthopaedics, The Affiliated Southeast Hospital of Xiamen University, Orthopaedic Center of the People's Liberation Army, Zhangzhou 363000, China.
authors.forename: Liang-Qi
authors.initials: LQ
authors.lastname: Kang
authors.affiliation: Department of Orthopaedics, The Affiliated Southeast Hospital of Xiamen University, Orthopaedic Center of the People's Liberation Army, Zhangzhou 363000, China.
authors.forename: Jiang-Ze
authors.initials: JZ
authors.lastname: Wang
authors.affiliation: Department of Orthopaedics, The Affiliated Southeast Hospital of Xiamen University, Orthopaedic Center of the People's Liberation Army, Zhangzhou 363000, China.
authors.forename: Zhen-Qi
authors.initials: ZQ
authors.lastname: Ding
keywords: Developmental dysplasia hip; Hip dysplasia; arthroplasty; cementless; congenital; distal femoral shortening; hip; hip dislocation; replacement; total hip arthroplasty