title: Total knee arthroplasty using navigation system for severe osteoarthritis with extra-articular deformity.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the use of total knee arthroplasty (TKA) using a computer-assisted navigation system for treating osteoarthritis with extra-articular deformity.
  
  
  METHODS
  Between January 2006 and January 2009, computer-assisted navigation TKAs were performed on eight knees in eight patients, who had severe osteoarthritis with an ipsilateral extra-articular deformity. All patients were followed up for a minimum of 24 months. The involved knees were evaluated by function scores, Knee Society knee scores, and analyzing knee flexion before the operation and at the latest follow-up.
  
  
  RESULTS
  Postoperatively, the function scores, Knee Society knee scores, and knee flexion all improved significantly. The ideal mechanical axis of the lower extremity was obtained in all cases.
  
  
  CONCLUSIONS
  TKA using a computer-assisted navigation system might provide an efficient treatment for patients with osteoarthritis in combination with an extra-articular deformity.
authors: Department of Orthopaedic Surgery, The Sixth Affiliated People's Hospital, Medical School of Shanghai JiaoTong University, No. 600 Yishan Road, 200233 Shanghai, China.
authors: Zhongtang
authors: Z
authors: Liu
authors: Xiaoyun
authors: X
authors: Pan
authors: Xianlong
authors: X
authors: Zhang
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods*; D005260:Female; D006801:Humans; D057913:Joint Capsule Release / Q000295:instrumentation / Q000379:methods; D016916:Joint Deformities, Acquired / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D016059:Range of Motion, Articular; D020127:Recovery of Function; D025321:Surgery, Computer-Assisted / Q000379:methods*; D058971:Tenotomy / Q000295:instrumentation / Q000379:methods; D016896:Treatment Outcome