Combined Anteversion Technique using Computer Navigation for Total Hip Arthroplasty

Abstract

Choosing a correct combined cup and stem anteversion in total hip arthroplasty (THA) will yield a maximized, stable range of motion and will reduce the risk for dislocation. From August 2008, we have established a safe zone of combined anteversion of 30° to 50° and performed THA on 33 hips using Stryker Navigation's CT-Hip system. The aim of this study was to investigate the accuracy of the cup and stem positions. The evaluation of implant position has been performed on postoperative CT, with the aid of CT-based planning software. Combined anteversion was 37.9±6.2° (standard deviation) (range, 24-52°). Femoral stem anteversion was 20.6±7.1° (10-33°) and cup anteversion was 17.3±4.8° (7-26°). The combined anteversion with computer navigation was within the safe zone of 30 to 50 for 29 of 33 (88%) hips. The results of this study indicate that the combined anteversion technique using computer navigation for THA is a reliable method.