title: Computer navigation versus conventional implantation for varus knee total arthroplasty: a case-control study at 5 years follow-up.
abstract: BACKGROUND
  There is no evidence in the current literature of any significant improvement in clinical outcome when comparing computer-assisted total knee arthroplasty (CATKA) with conventional implantation. Analyses of alignment and of component orientation have shown both significant and non-significant differences between the two methods.
  
  
  OBJECTIVE
  We compared computer-assisted and conventional surgery for TKA at 5.4 years follow-up for patients with varus osteoarthritic knees. Our goal was to assess clinical outcome and restoration of normal limb alignment.
  
  
  METHODS
  We performed a retrospective case-control study comparing 30 patients who underwent CATKA with 30 subjects who underwent TKA by conventional methods. Patients were matched individually by preoperative clinical conditions and alignment. We analysed intraoperative data (surgical time and intraoperative complications), postoperative complications, lower limb alignment, radiographic complication on X-ray imaging, and clinical outcome through knee and function score and range of motion.
  
  
  CONCLUSIONS
  We found no significant clinical difference between the two groups at 5 years post-surgery. However there was a statistically significant improvement in the restoration of the mechanical axis of the lower limb in the coronal plane but not in the sagittal plane. Whether or not this leads to a higher survival rate in the longer term requires further investigation.
authors.affiliation: DINOG Department, University of Genoa, Italy.
authors.forename: Luigi
authors.initials: L
authors.lastname: Molfetta
authors.forename: Davide
authors.initials: D
authors.lastname: Caldo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D016022:Case-Control Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D020370:Osteoarthritis, Knee / Q000601:surgery; D017063:Outcome Assessment, Health Care; D011859:Radiography; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D025321:Surgery, Computer-Assisted