Abstract
Introduction
This feasibility study investigated the accuracy of anterior pelvic reference plane (APP) registration and acetabular cup orientation in two cadavers with different BMIs.
Method
Five observers each registered the APP five times in the 2 cadavers (BMIs: 32 kg/m² and 25 kg/m²) using an ultrasound-based navigation system. By comparison against the CT-derived reference landmarks, the errors in determining the individual landmarks defining the APP, as well as the resulting errors in the orientation of the APP and the acetabular cup orientation were determined.
Results
Across all measurements obtained with the ultrasound navigation system, the errors in rotation and version in determining the APP were 0.5° ± 1.0° and −0.4° ± 2.0°, respectively. The cup abduction and anteversion errors determined from all measurements of the five investigators for both cadavers together were −0.1° ± 1.0° and −0.4° ± 2.7°, respectively. The data further demonstrated a high reproducibility of the measurements for the resulting cup adduction and anteversion angle.
Conclusion
Our preliminary results confirm that ultrasound navigation is a highly accurate tool that allows a reproducible registration of the APP and thereby enables accurate and precise intraoperative determination of the acetabular cup orientation also in patients with increased BMI.
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Acknowledgments
This study was partially supported by the German Research Foundation (DFG SFB 760).
Conflict of interest
The study was partially supported by Aesculap, and the authors of the study disclose the following financial relationships to the company: GIW, MOH, OH and CP are on the speakers list of Aesculap, while IS is an employee of Aesculap. However, Aesculap did not exert any influence on the study methods, results, or interpretation of the data.
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G. I. Wassilew, M.O. Heller, and O. Hasart contributed equally to the manuscript.
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Wassilew, G.I., Heller, M.O., Hasart, O. et al. Ultrasound-based computer navigation of the acetabular component: a feasibility study. Arch Orthop Trauma Surg 132, 517–525 (2012). https://doi.org/10.1007/s00402-011-1412-4
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DOI: https://doi.org/10.1007/s00402-011-1412-4