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Effect of a modular neck hip prosthesis on anteversion and hip rotation in total hip arthroplasty for developmental dysplasia of the hip

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

Total hip arthroplasty (THA) is often required to decrease the excessive anatomical femoral anteversion (AA) in developmental dysplasia of the hip. Studies have recommended decreasing the AA via the use of a retroverted modular neck. However, hip rotation after THA may strengthen or weaken the effect of changing the AA. Thus, the present study analyzed the effect of a retroverted neck on AA and hip rotation. Patients who underwent THA using a straight neck (ST group) or a 15° retroverted neck (RV group) in a version changeable dual modular system (Mainstay stem, Kyocera, Kyoto, Japan) were retrospectively reviewed. After matching for age, body mass index, and surgical approach, 44 patients were included in each group. The AA and hip rotation (femoral rotational angle: FRA) were measured on CT images acquired preoperatively and 1 month after THA, and were compared between the groups. The mean ± standard deviation preoperative AA of the ST group (26.1 ± 10.7°) was significantly smaller than that of the RV group (44.2 ± 7.8°) (p < 0.001). In contrast, the postoperative AA did not significantly differ between the groups (ST group 27.5 ± 9.8°, RV group 25.1 ± 8.3°, p = 0.406). The change in FRA after THA did not significantly differ between the groups (ST group − 3.8 ± 9.9°, RV group − 3.5 ± 9.1°, p = 0.841). In conclusion, a 15° retroverted neck was useful in controlling AA in hips with excessive AA, and the change in FRA after THA did not differ between the ST group and the RV group.

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Author notes

  1. Ema Nakahara and Keisuke Uemura contributed equally to the article.

Authors and Affiliations

  1. Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Ema Nakahara, Keisuke Uemura, Wataru Ando & Nobuhiko Sugano

  2. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan

    Hidetoshi Hamada & Masaki Takao

Authors
  1. Ema Nakahara
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  2. Keisuke Uemura
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  3. Wataru Ando
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  4. Hidetoshi Hamada
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  5. Masaki Takao
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  6. Nobuhiko Sugano
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Corresponding authors

Correspondence to Keisuke Uemura or Nobuhiko Sugano.

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The authors declare that Kyocera partially funds the department, which has no relevance to the study conducted herein.

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Nakahara, E., Uemura, K., Ando, W. et al. Effect of a modular neck hip prosthesis on anteversion and hip rotation in total hip arthroplasty for developmental dysplasia of the hip. J Artif Organs 23, 255–261 (2020). https://doi.org/10.1007/s10047-020-01162-3

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  • DOI: https://doi.org/10.1007/s10047-020-01162-3

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