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Advances in Orthopedics
Volume 2011, Article ID 171783, 6 pages
Research Article

Clinical Validation of Computer-Assisted Navigation in Total Hip Arthroplasty

1Laboratoire de Recherche en Orthopédie, Hôpital du Sacré-Cœur de Montréal, 5400 Boulevard Gouin Ouest, Locales K-3115, Montréal, QC, Canada H4J 1C5
2ORTHOsoft Inc., Computer Assisted Surgery, 75 Queen Street, Suite 3300, Montréal, QC, Canada H3C 2N6
3Département de kinésiologie, Université de Montréal, 2100 Édouard-Montpetit, Montréal, QC, Canada H3T 1J4

Received 14 July 2010; Accepted 6 October 2010

Academic Editor: Allen L. Carl

Copyright © 2011 Eric Beaumont et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A CT-based navigation system is helpful to evaluate the reamer shaft and the impactor position/orientation during unilateral total hip arthroplasty (THA). The main objective of this study is to determine the accuracy of the Navitrack system by measuring the implant's true anteversion and inclination, based on pre- and postoperative CT scans ( patients). The secondary objective is to evaluate the clinical validity of measurements based on postop anteroposterior (AP) radiographs for determining the cup orientation. Postop CT-scan reconstructions and postop planar radiographs showed no significant differences in orientation compared to peroperative angles, suggesting a clinical validity of the system. Postoperative AP radiographs normally used in clinic are acceptable to determine the cup orientation, and small angular errors may originate from the patient position on the table.