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Osteoporosis International

, Volume 17, Issue 9, pp 1404–1409 | Cite as

The population burden of fractures originates in women with osteopenia, not osteoporosis

  • J. A. Pasco
  • E. Seeman
  • M. J. Henry
  • E. N. Merriman
  • G. C. Nicholson
  • M. A. Kotowicz
Original article

Abstract

Introduction

Osteoporosis is associated with increased risk for fracture. However, most postmenopausal women have bone mineral density (BMD) within the normal or osteopenic range. The aim of this study was to determine the proportion of the population burden of fragility fractures arising from women at modest risk for fracture.

Methods

We measured baseline BMD in a population-based random sample of 616 postmenopausal women aged 60–94 years and followed these individuals for a median of 5.6 years (IQR 3.9–6.5) to determine the incidence of fractures according to age, BMD and the presence of a prior fracture.

Results

Based on WHO criteria, 37.6% of the women had normal total hip BMD, 48.0% had osteopenia and 14.5% had osteoporosis. The incidence of fracture during follow-up was highest in women with osteoporosis, but only 26.9% of all fractures arose from this group; 73.1% occurred in women without osteoporosis (56.5% in women with osteopenia, 16.6% in women with normal BMD). Decreasing BMD, increasing age and prior fracture contributed independently to increased fracture risk; in a multivariate model, the relative risk for fracture increased 65% for each SD decrease in BMD (RR=1.65, 95%CI 1.32–2.05), increased 3% for every year of age (RR=1.03, 95%CI 1.01–1.06) and doubled with prevalent fracture (RR=2.01, 95% CI 1.40–2.88). A prevalent fracture increased the risk for fractures such that women with osteopenia and prevalent fracture had the same, if not greater, risk as women with osteoporosis alone.

Conclusions

Reducing the population burden of fractures requires attention to women with osteopenia, as well as osteoporosis, because over half of the fragility fractures in the population arise in these individuals, and women with osteopenia plus a prevalent fracture have the same fracture risk as women with osteoporosis.

Keywords

Bone mineral density Epidemiology Fracture risk Osteoporosis Population study 

Notes

Acknowledgements

The study was funded by grants from the Victorian Health Promotion Foundation and the Geelong Region Medical Research Foundation.

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2006

Authors and Affiliations

  • J. A. Pasco
    • 1
  • E. Seeman
    • 2
  • M. J. Henry
    • 1
  • E. N. Merriman
    • 1
  • G. C. Nicholson
    • 1
  • M. A. Kotowicz
    • 1
  1. 1.Department of Clinical and Biomedical Sciences: Barwon Health, The Geelong HospitalThe University of MelbourneGeelongAustralia
  2. 2.Department of Medicine, The Austin and Repatriation Medical CentreThe University of MelbourneHeidelbergAustralia

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