title: Cutting and implanting errors in minimally invasive total knee arthroplasty using a navigation system.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the accuracy of bone cutting and implantation in minimally invasive total knee arthroplasty with image-free navigation.
  
  
  METHODS
  The alignment of the tibial and femoral bone resection was measured in 40 knees during surgery. The alignment measurement was repeated after cementing the tibial and femoral components. We evaluated the cutting error and the implanting error.
  
  
  RESULTS
  The mean tibial cutting errors were 0.5 and 0.7° in the frontal and sagittal planes, respectively. The mean femoral cutting errors were 0.5 and 0.9° in the frontal and sagittal planes, respectively. The mean tibial implanting errors were 1.0 and 0.9° in the frontal and sagittal planes, respectively. The mean femoral implanting error was 0.7° in the frontal plane.
  
  
  CONCLUSIONS
  Computer-assisted navigation was useful in checking the alignment of both bone cut and cementation.
authors.affiliation: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Mie, 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; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000592:standards*; D017760:Bone Malalignment / Q000517:prevention & control*; D006801:Humans; D007720:Knee Prosthesis; D019300:Medical Errors / Q000517:prevention & control*; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011446:Prospective Studies; D025321:Surgery, Computer-Assisted / Q000379:methods*; D016896:Treatment Outcome