Improving Acetabular Cup Orientation in Total Hip Arthroplasty by Using Smartphone Technology
Abstract
Acetabular cup placement in total hip arthroplasty is often difficult to assess, especially in the lateral position and using the posterior approach. Conventional techniques and computer-assisted surgery are the 2 most popular methods for proper placement of the acetabular cup in Lewinnek's safe zone of orientation (anteversion 15° ± 10° and lateral inclination 40° ± 10°). We developed a system that uses the accelerometer and camera function of the iPhone. A level indicator application and protractor application were downloaded to the iPhone and used to improve acetabular cup placement. This system has proven to be accurate and quick. Our series of 50 prospective cases showed good results with all our acetabular cups being placed within a narrow range in the safe zone and with less than 5% difference between the preoperative, intraoperative, and postoperative acetabular inclinations.
Keywords: acetabular cup orientation, total hip arthroplasty, smartphone technology, iPhone
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The Conflict of Interest statement associated with this article can be found at doi:10.1016/j.arth.2011.11.014.
No benefits of any form have been received from a commercial party related directly or indirectly to the subject of this article. The content of this article is the sole work of the authors.
PII: S0883-5403(11)00641-3
doi:10.1016/j.arth.2011.11.014
© 2012 Published by Elsevier Inc.
