Abstract
Background
The accuracy of a CTโbased hip navigation might depend on surgical approaches, resulting in varying accuracy of implant alignment.
Methods
We performed primary cementless total hip arthroplasty (THA) with miniโincision surgery (MIS) to 40 wellโmatched patients (anterior or posterior approaches, 20 hips each), using navigation with surface registration. We investigated cup alignment using postoperative computed tomography (CT) and compared the navigation accuracy between the two approaches, i.e. the difference between intraโoperative and postoperative alignments of the cup.
Results
There was no significant difference between the two approaches. The mean navigation accuracies in abduction and anteversion were 2.0ยฐ (SD 1.4ยฐ ) and 2.7ยฐ (SD 1.9ยฐ ), respectively, in the anterior approach, and 2.4ยฐ (SD 2.0ยฐ ) and 2.0ยฐ (SD 1.4ยฐ ), respectively, in the posterior approach. All cup alignments were within 10ยฐ of the target orientation.
Conclusions
This CTโbased navigation for MISโTHA provides navigation accuracy without significant differences between the two approaches and with favourable alignment of the cup. Copyright ยฉ 2008 John Wiley & Sons, Ltd.