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Does difference in stem design affect accuracy of stem alignment in total hip arthroplasty with a CT-based navigation system?

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  • Artificial Skin, Muscle, Bone / Joint, Neuron
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Abstract

The efficacy of a computed tomography (CT)-based navigation system to accurately position the stem for intended alignment is unclear. In addition, the influence of stem design on the accuracy of insertion is unknown. We therefore retrospectively compared the accuracy and precision for the intended alignment of two different designs of femoral stem which were implanted with or without the navigation system. Forty-nine total hip arthroplasties (THAs) using a tapered wedge stem and 91 THAs using an anatomic stem were evaluated for the navigation group. Thirty-three THAs using the tapered wedge stem and 15 THAs using the anatomic stem were controls for the non-navigation group. Differences between postoperative measurement and preoperative planning were compared among the groups. In the navigation groups, accuracy (mean absolute difference) and precision (95% limits of agreement) of stem anteversion were 4.3° and ± 10.1° in the tapered wedge stem and 3.1° and ± 6.9° in the anatomic stem. In the non-navigation groups, these were 6.0° and ± 15.2° and 4.8° and ± 12.4°, respectively. The accuracy and precision in the navigation groups were significantly superior to those in the non-navigation group, and those in the anatomic stem group were significantly superior to those in the tapered wedge group. Using the CT-based navigation system, the accuracy and precision for intended stem anteversion were improved. When compared under guidance of navigation system, the accuracy and precision for intended stem anteversion in the anatomic stem were superior to those in the tapered wedge stem.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, National Hospital Organization, Osaka National Hospital, 2-1-14 Hoenzaka, Chuo-ku, Osaka, 5400006, Japan

    Ichiro Nakahara & Hidenobu Miki

  2. Department of Orthopaedic Surgery, Bellland General Hospital, 500-3 Higashiyama, Naka-ku, Sakai-city, Osaka, 5998247, Japan

    Takayuki Kyo

  3. Department of Orthopaedic Surgery, Suita Municipal Hospital, 5-7 Kishibeshinmachi, Suita-city, Osaka, 5648567, Japan

    Yasuo Kuroda

Authors
  1. Ichiro Nakahara
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  2. Takayuki Kyo
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  4. Hidenobu Miki
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Correspondence to Ichiro Nakahara.

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Nakahara, I., Kyo, T., Kuroda, Y. et al. Does difference in stem design affect accuracy of stem alignment in total hip arthroplasty with a CT-based navigation system?. J Artif Organs 24, 74–81 (2021). https://doi.org/10.1007/s10047-020-01196-7

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  • DOI: https://doi.org/10.1007/s10047-020-01196-7

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