• Eur Spine J · Jun 2022

    Pelvic thickness, sex, ethnicity, and age affect pelvic incidence in healthy volunteers of Multi-Ethnic Alignment Normative Study (MEANS) database.

    • Kazuhiro Hasegawa, Shun Hatsushikano, Jean-Charles Le Huec, Zeeshan Sardar, Hee-Kit Wong, HeyHwee Weng DennisHWDDepartment of Orthopedic Surgery, National University Hospital (Singapore), Singapore, Singapore., Gabriel Liu, Stephane Bourret, Michael Kelly, Hend Riahi, Mouna Chelli-Bouaziz, and Lawrence G Lenke.
    • Niigata Spine Surgery Center, 2-5-22 Nishi-machi, Niigata City, Japan. kazu3795jp@yahoo.co.jp.
    • Eur Spine J. 2022 Jun 1; 31 (6): 1421-1430.

    BackgroundThe purpose of this study was to investigate the affecting factors on pelvic incidence (PI) and to test the hypothesis that PI changes even after skeletal maturity probably due to hypermobility of the sacroiliac joint using a large international multi-center database.MethodsA prospective and cross-sectional healthy adult volunteers, ages 18-80 years, across 5 countries were used. Radiographic measurements included standard whole body alignment parameters. Bivariate regression analyses between PI versus demographics and spino-pelvic anatomical parameters were performed. An effect of sex on pelvic anatomical parameters was also investigated. Multivariate logistic regression with a forward stepwise procedure was performed to identify the contributing factors to PI, and an appropriate model was obtained.ResultsPI showed a significant positive correlation with age in pooled data. Divided by sex, however, there was no correlation in men, but women showed a significant higher correlation coefficient. Pelvic thickness (PTh) had a significant negative correlation with age in pooled data. Divided by sex, no correlation was found in men, but there was a significant correlation in women with higher correlation coefficient. The stepwise multivariate analysis for the factors on PI identified four significant factors: age, sex, ethnicity, and PTh.ConclusionsPTh, sex, ethnicity, and age affected PI. There was a positive correlation between PI and age. The tendency was more significant in woman than in man. The results support the hypothesis that PI increases with aging, but the change seems to be small and needs to be verified in a longitudinal evaluation.© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

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