title: [Useability of an image based nagivation system in reconstruction of leg alignment in total knee arthroplasty - results of a propsective study].
abstract: Accurate leg alignment is one important factor for long term survival in total knee arthroplasty (TKA). The aim of this study was to determine the accuracy of a CT-based navigation system in restoration of the leg axis. 80 TKA (P.F.C.-Sigma--DePuy) were implanted either using a CT-based navigation-system or the conventional technique. There were no significant differences between the groups according to the preoperative leg deformity. Accuracy of implantation was determined on postoperative long-leg coronal and lateral x-rays. A postoperative leg axis between 3 degrees varus and 3 degrees valgus was obtained in 35/40 patients (88%) in the computer assisted and 28/40 patients (70%) in the conventional operated group. A higher precision in the sagittal plane was seen for the tibial (computer assisted: 3.9 +/- 2.2 vs. conventional TKA 1.3 +/- 5.8) and the femoral component (computer assisted: 3.5 +/- 2.3 vs. conventional TKA 6.9 +/- 3.6). The use of the CT-based VectorVision-System allows a significant improvement in the accuracy of implantation in TKA. The CT-based module has the advantage of a precise preoperative planning and a useful documentation and control tool for each important step. On the other hand there are additional costs and time consuming logistics.
authors.affiliation: Orthopädische Klinik, Universität Regensburg am Bayerischen Rheuma- und Orthopädie-Zentrum gGmbH des BRK, Bad Abbach. lars.perlick@klinik.uni-regensburg.de
authors.forename: L
authors.initials: L
authors.lastname: Perlick
authors.forename: H
authors.initials: H
authors.lastname: Bäthis
authors.forename: M
authors.initials: M
authors.lastname: Tingart
authors.forename: Th
authors.initials: T
authors.lastname: Kalteis
authors.forename: J
authors.initials: J
authors.lastname: Grifka
mesh_terms: D000328:Adult; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007593:Joint Instability / Q000000981:diagnostic imaging* / Q000209:etiology / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D016896:Treatment Outcome