Osteoporosis International

, Volume 21, Issue 9, pp 1513–1522 | Cite as

Prevalent vertebral deformity independently increases incident vertebral fracture risk in middle-aged and elderly Japanese women: The Japanese Population-based Osteoporosis (JPOS) Cohort Study

  • E. Kadowaki
  • J. Tamaki
  • M. Iki
  • Y. Sato
  • Y. Chiba
  • E. Kajita
  • S. Kagamimori
  • Y. Kagawa
  • H. Yoneshima
Original Article

Abstract

Summary

Prevalent vertebral deformity increases incident vertebral fracture risk according to studies focusing primarily on Caucasian elderly populations. We report a 3-fold increase in this risk in a population-based cohort of Japanese women after adjusting for subject propensity for having vertebral deformities. This relationship tended to be stronger in middle-aged women.

Introduction

Evidence on increased risk of incident vertebral fractures associated with vertebral deformity in middle-aged women is limited. We aimed to evaluate this risk in a population-based cohort of Japanese women.

Methods

We followed 712 women aged 50–79 years at baseline randomly selected from 3 municipalities in Japan for 6 years. McCloskey–Kanis criteria identified vertebral deformities on X-ray absorptiometric images. At follow-up, vertebra with ≥20% height reduction from baseline were considered incident fractures. Rate ratio (RR) of incident fracture for prevalent vertebral deformities was calculated using the Poisson regression equation adjusted for propensity of having vertebral deformities based on potential risk factors.

Result

Vertebral fractures occurred in 73 women (10.3%). Crude RR of vertebral deformity-associated fracture was 4.63 [95% confidence interval (CI), 3.04–7.04] and decreased to 2.96 (95% CI, 1.77–4.94) after propensity score adjustment. Adjusted RR was generally greater in younger women at 7.19 (95% CI, 1.04–49.6), 3.19 (95% CI, 1.27–7.97), and 2.34 (95% CI, 1.33–4.11) for women aged 50–59, 60–69, and 70–79 years, respectively (p = 0.0527 for those aged 50–59 vs 70–79).

Conclusion

Vertebral deformity was associated with a 3-fold increase in subsequent vertebral fracture risk in Japanese women, and this association was stronger in middle-aged women.

Keywords

Incident vertebral fracture Japanese women Middle-aged women Population-based cohort study Prevalent vertebral deformity Propensity score 

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2009

Authors and Affiliations

  • E. Kadowaki
    • 1
  • J. Tamaki
    • 1
  • M. Iki
    • 1
  • Y. Sato
    • 2
  • Y. Chiba
    • 3
  • E. Kajita
    • 4
  • S. Kagamimori
    • 5
  • Y. Kagawa
    • 6
  • H. Yoneshima
    • 7
  1. 1.Department of Public HealthKinki University School of MedicineOsaka-SayamaJapan
  2. 2.Department of Human LifeJin-ai UniversityEchizenJapan
  3. 3.Department of Environmental Medicine and Behavioral ScienceKinki University School of MedicineOsaka-SayamaJapan
  4. 4.Department of Public Health and Home NursingNagoya University School of Health SciencesNagoyaJapan
  5. 5.University of ToyamaToyamaJapan
  6. 6.Kagawa Nutrition UniversityTokyoJapan
  7. 7.Shuuwa General HospitalKasukabeJapan

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