title: Minimally invasive total knee arthroplasty: comparison of jig-based technique versus computer navigation for clinical and alignment outcome.
abstract: OBJECTIVE
  Correct alignment of the leg and positioning of the components are important factors in good long-term outcome of total knee arthroplasty (TKA). Computer-assisted navigation systems were introduced to improve component alignment accuracies. The three main hypotheses of this study were that the navigated compared to jig-based patient will show the following: (1) No difference in clinical outcomes. (2) Better alignment in the frontal and sagittal plane. (3) Better rotational positioning of components.
  
  
  METHODS
  The authors evaluated 100 patients who had minimally invasive TKA using either an image-free computer-assisted navigation system (n=50) or a jig-based technique (n=50). Six months postoperatively, clinical and radiological evaluations were performed using full-length standing anteroposterior and lateral radiographs and CT scans of the knee.
  
  
  RESULTS
  Knee Society knee score, function score, and range of motion were comparable in the two groups after surgery. The percentage of patients with a frontal tibiofemoral angle within ±3° of the ideal was significantly higher in the navigated group than in the jig-based group (94% vs. 78%, respectively; P=0.041). No significant differences were found between groups in terms of the frontal and sagittal planes as well as rotational alignment of the femoral or tibial components.
  
  
  CONCLUSIONS
  Computer-assisted TKA gives a better correction of alignment of the leg compared with jig-based TKA when combined with a minimally invasive surgical approach.
authors.affiliation: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu City, Mie, 514-8507, Japan. masahase@clin.medic.mie-u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Kakunoshin
authors.initials: K
authors.lastname: Yoshida
authors.forename: Hiroki
authors.initials: H
authors.lastname: Wakabayashi
authors.forename: Akihiro
authors.initials: A
authors.lastname: Sudo
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods*; D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000517:prevention & control*; D016009:Chi-Square Distribution; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007593:Joint Instability / Q000517:prevention & control; D007720:Knee Prosthesis; D008297:Male; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects / Q000379:methods; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000601:surgery; D011182:Postoperative Care / Q000379:methods; D011475:Prosthesis Failure; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology*; D020127:Recovery of Function; D012189:Retrospective Studies; D018570:Risk Assessment; D018709:Statistics, Nonparametric; D025321:Surgery, Computer-Assisted / Q000009:adverse effects / Q000379:methods*; D013997:Time Factors; D016896:Treatment Outcome
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