title: Accuracy of side-cutting implantation instruments for total knee arthroplasty.
abstract: A new generation of implantation instruments were developed for quadriceps sparing surgical approaches during total knee arthroplasty (TKA). There is little information on the accuracy of the bone cuts performed with the side-cutting technique. A total of 100 patients were randomized to undergo computer-assisted TKA or non-navigated TKA using a mini-subvastus surgical approach and side-cutting implant instrumentation. The radiographic parameters, clinical outcomes and knee scores were evaluated 3 months postoperative. The mechanical axis of the limb was within 3 degrees varus/valgus in 76% of the patients who had navigated procedures versus 66% of patients who had conventional surgery. The tibial slope showed a rate of inaccuracy of 3 degrees or less for 78% of the patients in the navigated total knee arthroplasty group versus 66% of the patients in the conventional group. Clinical outcomes and knee scores were similar in both groups. The navigation technique could not compensate for shortcomings of the implantation instruments.
authors.affiliation: Department of Orthopedic Surgery, University Teaching Hospital, Medical University of Innsbruck, Carinagasse 47, 6800 Feldkirch, Austria. Arno.Martin@lkhf.at
authors.forename: Arno
authors.initials: A
authors.lastname: Martin
authors.forename: Mitchell B
authors.initials: MB
authors.lastname: Sheinkop
authors.forename: Mary M
authors.initials: MM
authors.lastname: Langhenry
authors.forename: Christian
authors.initials: C
authors.lastname: Oelsch
authors.forename: Mark
authors.initials: M
authors.lastname: Widemschek
authors.forename: Archibald
authors.initials: A
authors.lastname: von Strempel
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D019919:Prosthesis Implantation / Q000379:methods*; D011859:Radiography; D016059:Range of Motion, Articular; D020127:Recovery of Function; D015203:Reproducibility of Results; D025321:Surgery, Computer-Assisted / Q000379:methods*; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery; D016896:Treatment Outcome