title: Risk factors for dislocation after revision total hip arthroplasty: A systematic review and meta-analysis.
abstract: BACKGROUND
  No formal systematic review or meta-analysis was performed up to now to summarize the risk factors of dislocation after revision total hip arthroplasty(THA).
  
  
  OBJECTIVE
  The present study aimed to quantitatively and comprehensively conclude the risk factors of dislocation after revision total hip arthroplasty.
  
  
  METHODS
  A search was applied to CNKI, Embase, Medline, and Cochrane central database (all up to October 2016). All studies assessing the risk factors of dislocation after revision THA without language restriction were reviewed, and qualities of included studies were assessed using the Newcastle-Ottawa Scale. Data were pooled and a meta-analysis completed.
  
  
  RESULTS
  A total of 8 studies were selected, which altogether included 4656 revision THAs. 421 of them were cases of dislocation occurred after surgery, suggesting the accumulated incidence of 9.04%. Results of meta-analyses showed that age at surgery (standardized mean difference -0.222; 95% CI -0.413-0.031), small-diameter femoral heads (≤28 mm) (OR 1.451; 95%CI 1.056-1.994), history of instability (OR 2.739; 95%CI 1.888-3.974), number of prior revisions ≥ 3 (OR, 2.226; 95% CI, 1.569-3.16) and number of prior revisions ≥ 2 (OR 1.949; 95% CI 1.349-2.817), acetabular components with elevated rim liner were less likely to develop dislocation after revision THA (OR 0.611; 95% CI 0.415-0.898).
  
  
  CONCLUSIONS
  Related prophylaxis strategies should be implemented in patients involved with above-mentioned risk factors to prevent dislocation after revision THA.
authors.affiliation: Department of Joint Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, PR China. Electronic address: 18503278608@163.com.
authors.forename: Lele
authors.initials: L
authors.lastname: Guo
authors.affiliation: Department of Scientific Bureau, The Third Hospital of Hebei Medical University, Hebei, 050051, PR China. Electronic address: dryangyanj15@163.com.
authors.forename: Yanjiang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Hand Surgery, The Third Hospital of Hebei Medical University, Hebei, 050051, PR China. Electronic address: 1159052936@qq.com.
authors.forename: Biao
authors.initials: B
authors.lastname: An
authors.affiliation: Department of Hand Surgery, The Third Hospital of Hebei Medical University, Hebei, 050051, PR China. Electronic address: 419641897@qq.com.
authors.forename: Yantao
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Respiratory, Hebei General Hospital, Shijiazhuang, Hebei, 050051, PR China. Electronic address: 773744608@qq.com.
authors.forename: Linyuan
authors.initials: L
authors.lastname: Shi
authors.affiliation: Department of Joint Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, PR China. Electronic address: M13731160283@163.com.
authors.forename: Xiangzhen
authors.initials: X
authors.lastname: Han
authors.affiliation: Department of Joint Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, PR China; Department of Scientific Bureau, The Third Hospital of Hebei Medical University, Hebei, 050051, PR China; Department of Hand Surgery, The Third Hospital of Hebei Medical University, Hebei, 050051, PR China; Department of Respiratory, Hebei General Hospital, Shijiazhuang, Hebei, 050051, PR China. Electronic address: gsjhbykdxdsyy2007@163.com.
authors.forename: Shijun
authors.initials: S
authors.lastname: Gao
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D015994:Incidence; D004204:Joint Dislocations / Q000453:epidemiology* / Q000209:etiology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology / Q000601:surgery; D011475:Prosthesis Failure; D012086:Reoperation; D012307:Risk Factors
keywords: Dislocation; Revision total hip arthroplasty; Risk factors