Abstract
Purpose
This study aimed (1) to investigate the relationship between pelvic incidence (PI) and the anatomical acetabular anteversion (AA) relative to the spino-pelvic tilt (SPT) plane (anatomical AASPT), relative to the anterior pelvic plane (anatomical AAAPP), and functional standing AA; and (2) to compare AA and the sagittal spino-pelvic parameters of lumbo-pelvic complex types 1 (PI ≤ 30°) and 2 (PI > 30°), in Japanese females with hip osteoarthritis.
Methods
We conducted a retrospective study on 110 Japanese females with unilateral hip osteoarthritis. PI, standing lumbar lordosis (LL), standing SPT, anatomical AASPT, anatomical AAAPP, and functional standing AA were measured and calculated using radiographs and computed tomography. The PI-LL difference was defined as the mathematical difference between the PI and standing LL angles. Pearson’s correlation test was used to measure the relationship between the PI and AA. Student’s t test was used to compare spino-pelvic parameters between lumbo-pelvic complex type 1 (n = 24) and type 2 (n = 86).
Results
There was a significant relationship between the PI and anatomical AASPT (r = −0.532, p < 0.001), but no significant relationship between the PI and anatomical AAAPP (r = −0.021, p = 0.824) or functional standing AA (r = 0.104, p = 0.299). Lumbo-pelvic complex type 1 had a higher anatomical AASPT (22.4° ± 9.1° vs. 5.4° ± 15.1°, p < 0.001), similar anatomical AAAPP (15.0° ± 10.6° vs. 15.1° ± 15.3°, p = 0.981) and functional standing AA (12.4° ± 8.0° vs. 15.0° ± 14.1°, p = 0.254), a lower standing SPT (− 14.3° ± 11.0° vs. 13.7° ± 12.6°, p < 0.001), and a lower PI-LL difference (− 14.4° ± 18.5° vs. 6.4° ± 17.1°, p < 0.001) in comparison to lumbo-pelvic complex type 2.
Conclusion
Our findings will help to improve the understanding of hip anatomy and its relationship with the standing spino-pelvic alignment in Japanese females with hip osteoarthritis.
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TK: Conception, design of the study, data collection, critically drafting and revising the article for important intellectual content, and final approval of the version to be submitted. TM: Conception and design of the study, critically drafting and revising the article for important intellectual content, and final approval of the version to be submitted. TY: Data collection and final approval of the version to be submitted. MS: Final approval of the version to be submitted. CR: Critically drafting and revising the article for important intellectual content and final approval of the version to be submitted. MM: Final approval of the version to be submitted.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional review board of Saga Medical University School of Medicine (registration number: 2017-11-R-04) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Kobayashi, T., Morimoto, T., Yoshihara, T. et al. The relationship between pelvic incidence and anatomical acetabular anteversion in female Japanese patients with hip osteoarthritis: a retrospective iconographic study. Surg Radiol Anat 43, 1141–1147 (2021). https://doi.org/10.1007/s00276-021-02710-z
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DOI: https://doi.org/10.1007/s00276-021-02710-z