title: Total ankle arthroplasty - three-component total ankle arthroplasty in western France: a radiographic study.
abstract: BACKGROUND
  Although the literature has confirmed the short and intermediate term efficacy of three-component mobile-bearing total ankle arthroplasty (TAA), the development of progressive periprosthetic bone abnormalities threatens the intermediate and long term survival of these implants. The aim of this study was to evaluate whether TAA quality requirements were met and analyze radiological changes in arthroplasties performed by members of the French Western Orthopedics Society.
  
  
  METHODS
  This retrospective multicenter study included 173 patients who underwent three-component mobile-bearing arthroplasty between 1997 and 2010 in eight centers in western France. The etiology was osteoarthritis (OA) in 78% of cases and rheumatoid arthropathy in 13% of cases. The radiographic assessment included preoperative and final postoperative standing anteroposterior (AP) and lateral view radiographs. Radiographs were reviewed for ankle alignment, improper implant positions, and periprosthetic bone anomalies. Intraprosthetic range of motion was evaluated in 111 cases on dynamic radiographs.
  
  
  RESULTS
  Mean follow-up was 34 months (± 5). Fifteen percent of the cases presented implant malposition. Alignment was normal in 76% of cases. Intraprosthetic range of motion was 20.5° (± 3) in the cases that were evaluated. Bone cysts were observed in 33% of cases, radioluncencies in 72%, ossifications in 39%, migration of the tibial component in 5% and migration of the talar component in 27%. The latter were correlated to a range of motion of less than 15°. Additional surgery was necessary in 8% of cases to revise implants and/or for conversion to arthrodesis.
  
  
  CONCLUSIONS
  The high rate of radiolucencies and bone cysts at a mean follow-up of 2.8 years is of concern and these arthroplasties should be closely monitored. Stiff ankles seemed to be at a higher risk for subsidence.
  
  
  METHODS
  IV - Retrospective study.
authors.affiliation: Service de chirurgie orthopédique I, université François-Rabelais de Tours, CHRU de Tours, 37044 Tours cedex 9, France.
authors.forename: P
authors.initials: P
authors.lastname: Preyssas
authors.forename: É
authors.initials: É
authors.lastname: Toullec
authors.forename: M
authors.initials: M
authors.lastname: Henry
authors.forename: J-B
authors.initials: JB
authors.lastname: Neron
authors.forename: C
authors.initials: C
authors.lastname: Mabit
authors.forename: J
authors.initials: J
authors.lastname: Brilhault
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000843:Ankle Joint / Q000000981:diagnostic imaging* / Q000601:surgery*; D058737:Arthroplasty, Replacement, Ankle / Q000379:methods*; D004185:Disability Evaluation; D005260:Female; D005602:France / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology / Q000601:surgery; D011859:Radiography; D020127:Recovery of Function; D012008:Recurrence; D012086:Reoperation; D012189:Retrospective Studies; D015996:Survival Rate; D017211:Treatment Failure; D016896:Treatment Outcome