title: A new navigation system for minimally invasive total knee arthroplasty.
abstract: A computer-assisted navigation system to be used for total knee arthroplasties (TKAs) was reported to improve the accuracy of bone resection and result in precise implant placement, but the concomitant surgical invasion and time consumption are clinical problems. We developed a computed tomography (CT)-based navigation system (NNS) to be used for minimally invasive TKA. It requires only the reference points from a small limited area of the medial femoral condyle and proximal tibia through a skin incision to obtain optical images. Here we evaluated the usefulness and accuracy of the NNS in comparison with the commercially available BrainLAB image-free navigation system (BLS). In a clinical experiment, the registration times obtained with the NNS tended to be shorter than those obtained with the BLS, but not significantly so. The NNS group tended to be in the extended position in the sagittal plane of the distal femur within 3 degrees, and the BLS group showed rather flexed deviation in the sagittal plane of the anterior femur.
authors.affiliation: Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yokoyama
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Abe
authors.forename: Kazuo
authors.initials: K
authors.lastname: Fujiwara
authors.forename: Masahiko
authors.initials: M
authors.lastname: Suzuki
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Nakajima
authors.forename: Naohiko
authors.initials: N
authors.lastname: Sugita
authors.forename: Mamoru
authors.initials: M
authors.lastname: Mitsuishi
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Nakashima
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Ozaki
mesh_terms: D019643:Arthroplasty, Replacement / Q000379:methods; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D003198:Computer Simulation; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D007720:Knee Prosthesis; D019060:Minimally Invasive Surgical Procedures / Q000379:methods*; D008953:Models, Anatomic; D025321:Surgery, Computer-Assisted / Q000379:methods*; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery; D014057:Tomography, X-Ray Computed