title: Late dislocation after total hip arthroplasty.
abstract: OBJECTIVE
  Instability after total hip arthroplasty is a troublesome complication. It commonly occurs in the first 3 postoperative months, but the risk continues over time. There are numerous treatment options, but they have relatively unpredictable outcomes. Numerous factors have been associated with dislocation, but research has mainly focused on the surgical ones. Epidemiological factors remain the subject of much debate. We aimed to establish the incidence of dislocation over time.
  
  
  METHODS
  The Scottish National arthroplasty non-voluntary registry is based on SMR01 records (Scottish Morbidity Record) data. We analyzed the Scottish National Arthroplasty Project to find patients' dislocation rates.
  
  
  RESULTS
  There were 62,175 total hip arthroplasties performed from April 1989 to March 2004 with an annual incidence of dislocation of 0.9%. We found no increase in the rate of dislocation after 2 years.
  
  
  CONCLUSIONS
  It appears there is no late increase in dislocation rate.
  
  
  METHODS
  Prognostic study, level II-1 (prospective study).
authors.affiliation: Department of Orthopaedic Surgery, Southern General Hospital, 1345 Govan Road, Glasgow G51 4TF, Scotland, United Kingdom. rmdmeek@doctors.org.uk
authors.forename: R M D
authors.initials: RM
authors.lastname: Meek
authors.forename: D B
authors.initials: DB
authors.lastname: Allan
authors.forename: G
authors.initials: G
authors.lastname: McPhillips
authors.forename: L
authors.initials: L
authors.lastname: Kerr
authors.forename: C R
authors.initials: CR
authors.lastname: Howie
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006617:Hip Dislocation / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D015994:Incidence; D008137:Longitudinal Studies; D008297:Male; D009313:National Health Programs; D011446:Prospective Studies; D012606:Scotland / Q000453:epidemiology