title: The effect of computerized navigation on component alignment in total knee arthroplasty.
abstract: OBJECTIVE
  The aim of this retrospective cross-sectional study was to evaluate the effect of computer-assisted total knee arthroplasty (TKA) on component alignment.
  
  
  METHODS
  The radiographs of 20 patients who underwent computer-assisted TKA within a two-year period were analyzed with respect to the mechanical femorotibial, mechanical femoral, mechanical tibial angles (mFTA, mFA and mTA, respectively) and the tibial slope (σ).
  
  
  RESULTS
  The mean postoperative mFTA (179.7°) was significantly improved when compared to the preoperative value (175.45°) (p=0.012). The mean postoperative mFA was significantly reduced (p=0.035) in comparison with the preoperative mean (89.1° and 90.6°, respectively). The mean postoperative mTA was exactly 90.0°, while the preoperative mean was significantly lower (87.7°; p=0.003). Mean tourniquet time during TKA was 109.5 minutes.
  
  
  CONCLUSIONS
  Computer navigation in TKA appears to be a reliable system which facilitates implant positioning and component alignment.
authors.affiliation: Madre Teresa Hospital, Belo Horizonte, Brazil. lfmsbh@hotmail.com
authors.forename: Luiz Fernando Machado
authors.initials: LF
authors.lastname: Soares
authors.forename: Tarcizo Afonso
authors.initials: TA
authors.lastname: Nunes
authors.forename: Marco Antonio Percope
authors.initials: MA
authors.lastname: de Andrade
authors.forename: Philippe
authors.initials: P
authors.lastname: Neyret
authors.forename: Roger
authors.initials: R
authors.lastname: Badet
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011859:Radiography; D025321:Surgery, Computer-Assisted