Evaluation of the accuracy of femoral component orientation by the CT-based fluoro-matched navigation system |
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Authors: | Shinya Hayashi Takayuki Nishiyama Takaaki Fujishiro Shingo Hashimoto Noriyuki Kanzaki Kotaro Nishida Ryosuke Kuroda Masahiro Kurosaka |
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Institution: | 1. Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
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Abstract: | PurposeAccurate orientation of acetabular and femoral components are important during THA. However, no study has assessed the use of the CT-based fluoro-matched navigation system during THA. Therefore, we have evaluated the accuracy of stem orientation by CT-based fluoro-matched navigation.MethodsThe accuracy of stem orientation by CT-based fluoro-matched navigation was assessed by postoperative CT data. Furthermore, we compared the postoperative stem orientation with the intraoperative registration errors.ResultsThe average antetorsion error of the stem (navigation records ? postoperative CT) was ?0.5°?±?5.2°. The stem valgus error was 0.4°?±?2.7°. The accuracy of the navigation record for the orientation of the stem valgus was dependent on the intraoperative registration errors.ConclusionsThe clinical accuracy of CT-based fluoro-matched navigation is adequate for stem alignment orientation, and the intraoperative verification of registration errors is valuable for checking the accuracy of stem orientation by navigation. |
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