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

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Abstract

Background

The 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.

Methods

A 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.

Results

PI 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.

Conclusions

PTh, 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.

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Abbreviations

ASD:

Adult spine deformity

ANOVA:

Analysis of variance

BMI:

Body mass index

CI:

Confidence interval

EOS:

Biplanar slot-scanning stereoradiography

HA:

Hip axis

LL:

Lumbar lordosis

PI:

Pelvic incidence

PTh:

Pelvic thickness

PT:

Pelvic tilt

SIj:

Sacroiliac joint

SS:

Sacral slope

3D:

Three-dimensional

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Funding

No funding has received for the present study and the scientific paper.

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Authors and Affiliations

  1. Niigata Spine Surgery Center, 2-5-22 Nishi-machi, Niigata City, Japan

    Kazuhiro Hasegawa & Shun Hatsushikano

  2. Polyclinique Bordeaux Nord Aquitaine, Université Bordeaux, Bordeaux, France

    Jean-Charles Le Huec & Stephane Bourret

  3. Department of Orthopedic Surgery, Columbia University Medical Center, The Spine Hospital at New York Presbyterian, NY, USA

    Zeeshan Sardar & Lawrence G. Lenke

  4. Department of Orthopedic Surgery, National University Hospital (Singapore), Singapore, Singapore

    Hee-Kit Wong, Hwee Weng Dennis Hey & Gabriel Liu

  5. Rady Children’s Hospital, University of California, San Diego, 3020 Childrens Way, San Diego, CA, 92123, USA

    Michael Kelly

  6. Institut Kassab D’orthopédie, Ksar Said La Manouba, Tunis, Tunisia

    Hend Riahi & Mouna Chelli-Bouaziz

Authors
  1. Kazuhiro Hasegawa
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  2. Shun Hatsushikano
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  3. Jean-Charles Le Huec
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  4. Zeeshan Sardar
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  5. Hee-Kit Wong
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  6. Hwee Weng Dennis Hey
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  7. Gabriel Liu
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  8. Stephane Bourret
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  9. Michael Kelly
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  10. Hend Riahi
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  11. Mouna Chelli-Bouaziz
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  12. Lawrence G. Lenke
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Corresponding author

Correspondence to Kazuhiro Hasegawa.

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Conflict of interest

The authors declare that they have no competing interests.

Ethical approval and consent to participate

The study was approved by the Institutional ethics review boards of all centers. The ethics committee of Niigata Spine Surgery Center approved with the committee’s reference number: IRB Approval #6 (R3)-2021.

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Hasegawa, K., Hatsushikano, S., Le Huec, JC. et al. Pelvic thickness, sex, ethnicity, and age affect pelvic incidence in healthy volunteers of Multi-Ethnic Alignment Normative Study (MEANS) database. Eur Spine J 31, 1421–1430 (2022). https://doi.org/10.1007/s00586-022-07134-w

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  • DOI: https://doi.org/10.1007/s00586-022-07134-w

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