title: Late dislocation is associated with recurrence after total hip arthroplasty.
abstract: OBJECTIVE
  This study was conducted to examine the risk factors for recurrent dislocation after total hip arthroplasty (THA) and test the hypothesis that late dislocations are associated with recurrence.
  
  
  METHODS
  A total of 1,250 hips in 1,017 patients were retrospectively reviewed. All operations were performed through the posterolateral approach with posterior soft tissue repair. An early or late dislocation was defined as a dislocation occurring before or after one year postoperatively, respectively.
  
  
  RESULTS
  Dislocation occurred in 36 hips (2.9 %) and 20 of them experienced recurrence. Recurrent dislocations were observed in ten out of 25 hips (40.0 %) with early dislocation; however, ten out of 11 hips (90.9 %) with late dislocation experienced recurrence (p = 0.0046). Multivariate analysis revealed that late dislocation was significantly associated with recurrence with odds ratio of 5.94 per year. Seven in 20 hips with recurrent dislocation required surgical treatment.
  
  
  CONCLUSIONS
  Late dislocation significantly contributed to the development of recurrent dislocations.
authors.affiliation: Department of Orthopaedic Surgery, Kyushu University, 1-3-3 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Itokawa
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Nakashima
authors.forename: Takuaki
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Goro
authors.initials: G
authors.lastname: Motomura
authors.forename: Masanobu
authors.initials: M
authors.lastname: Ohishi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Hamai
authors.forename: Mio
authors.initials: M
authors.lastname: Akiyama
authors.forename: Masanobu
authors.initials: M
authors.lastname: Hirata
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hara
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006617:Hip Dislocation / Q000453:epidemiology* / Q000209:etiology*; D006621:Hip Joint / Q000601:surgery*; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D015207:Osteoarthritis, Hip / Q000601:surgery; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D055815:Young Adult