title: Arthroplasty in patients with extensive femoral head avascular necrosis: Cementless arthroplasty in extensive femoral head necrosis.
abstract: OBJECTIVE
  The purpose of this study was to investigate the outcomes of using cementless femoral stem for extensive osteonecrosis of the femoral head involving the proximal femur.
  
  
  METHODS
  A total of 21 patients (27 hips) in the study group defined as extensive ONFH involving proximal femur and 42 patients (52 hips) with the diagnosis of regular osteonecrosis of the femoral head in the control group were enrolled in the study. Clinical and radiographic follow-ups were documented at three, six, 12 and 24 months postoperatively.
  
  
  RESULTS
  Results improved for Harris hip score in both groups. In the study group undersized stem implantation and lateralized mal-position were identified. Subsequent subsidence was also found.
  
  
  CONCLUSIONS
  Pre-operative templating and intra-operative X-ray confirmation are necessary to avoid complications.
authors.affiliation: Department of Orthopaedic Surgery, The First Hospital of Jilin University, Xinmin St 71, Changchun, China.
authors.forename: Yu-Hang
authors.initials: YH
authors.lastname: Gao
authors.forename: Shu-Qiang
authors.initials: SQ
authors.lastname: Li
authors.forename: Yun-Feng
authors.initials: YF
authors.lastname: Wang
authors.forename: Chen
authors.initials: C
authors.lastname: Yang
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Liu
authors.forename: Xin
authors.initials: X
authors.lastname: Qi
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D002484:Cementation; D005260:Female; D005271:Femur Head Necrosis / Q000150:complications / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000150:complications; D011474:Prosthesis Design; D016896:Treatment Outcome