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Morphological variation of the anterior inferior iliac spine affects hip range of motion in flexion after rotational acetabular osteotomy

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Abstract

Purpose

Reduced range of motion (ROM) in flexion and internal rotation are associated with impaired activities of daily living (ADL) after rotational acetabular osteotomy (RAO). This study focused on the morphological variation of the anterior inferior iliac spine in developmental dysplasia of the hip (DDH) and its impact on post-operative bony ROM after RAO. This study aimed to investigate the association between bony ROM after RAO and pre-operative morphological factors of the pelvis and femur, including a positional variation of the anterior inferior iliac spine.

Methods

Bony ROM in 52 patients with DDH was assessed after virtual RAO using computed tomography (CT). Post-operative acetabular coverage was set at lateral and anterior centre-edge angles of 30° and 55°, respectively. The position of the anterior inferior iliac spine was classified as higher or lower.

Results

Multiple regression analysis revealed that the lower anterior inferior iliac spine and higher femoral neck shaft angle were significantly associated with the lower flexion angle after RAO. Lower femoral anteversion, higher femoral neck shaft angle and higher alpha angle at the anterosuperior part were significantly associated with lower internal rotation angle at 90° flexion after RAO.

Conclusion

Therefore, morphological variation of the anterior inferior iliac spine affected bony ROM in flexion and that of the femoral neck affected bony ROM in internal rotation at flexion after RAO.

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Acknowledgements

The authors would like to thank Dr. Keisuke Uemura (Department of Orthopedic Medical Engineering, Osaka University Graduate School of Medicine, Suita, Japan) for his assistance analysing the reproducibility of the morphological study.

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Authors and Affiliations

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

    Hidetoshi Hamada & Takashi Sakai

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

    Masaki Takao & Nobuhiko Sugano

Authors
  1. Hidetoshi Hamada
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  2. Masaki Takao
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  3. Takashi Sakai
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  4. Nobuhiko Sugano
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Corresponding author

Correspondence to Nobuhiko Sugano.

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Conflict of interest

Hidetoshi Hamada, Masaki Takao, Takashi Sakai, and Nobuhiko Sugano declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.

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Hamada, H., Takao, M., Sakai, T. et al. Morphological variation of the anterior inferior iliac spine affects hip range of motion in flexion after rotational acetabular osteotomy. International Orthopaedics (SICOT) 42, 1247–1252 (2018). https://doi.org/10.1007/s00264-017-3673-1

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  • DOI: https://doi.org/10.1007/s00264-017-3673-1

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