Osteoporosis International

, Volume 25, Issue 1, pp 235–241 | Cite as

Mild morphometric vertebral fractures predict vertebral fractures but not non-vertebral fractures

  • H. Johansson
  • A. Odén
  • E. V. McCloskey
  • J. A. Kanis
Original Article

Abstract

Summary

In this meta-analysis of the control arms of four phase 3 trials, mild vertebral fractures were a significant risk factor for future vertebral fractures but not for non-vertebral fracture.

Introduction

A prior vertebral fracture is a risk factor for future fracture that is commonly used as an eligibility criterion for treatment and in the assessment of fracture probability. The aim of this study was to determine the prognostic significance of a morphometric fracture according to the severity of fracture.

Methods

We examined the control (placebo) treated arms of four phase 3 trials. Vertebral fracture status was graded at baseline in 7,623 women, and fracture outcomes were documented over the subsequent 20,000 patient-years. Fracture outcomes were characterised as a further vertebral fracture, a non-vertebral fracture or a clinical fracture (non-vertebral plus clinical vertebral fracture). The relative risk of fracture was computed from the merged β coefficients of each trial weighted according to the variance.

Results

Mild vertebral fractures were a significant risk factor for vertebral fractures [risk ratio (RR) = 2.17; 95 % CI = 1.70–2.76] but were not associated with an increased risk of non-vertebral fractures (RR = 1.08; 95 % CI = 0.86–1.36). Moderate/severe vertebral fractures were associated with a high risk of vertebral fractures (RR = 4.23; 95 % CI = 3.58–5.00) and a moderate though significant increase in non-vertebral fracture risk (RR = 1.64; 95 % CI = 1.38–1.94).

Conclusions

Prior moderate/severe morphometric vertebral fractures are a strong and significant risk factor for future fracture. The presence of a mild vertebral fracture is of no significant prognostic value for non-vertebral fractures. These findings should temper the use of morphometric fractures in the assessment of risk and the design of phase 3 studies.

Keywords

Fracture risk Meta-analysis Vertebral morphometry 

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2013

Authors and Affiliations

  • H. Johansson
    • 1
  • A. Odén
    • 1
  • E. V. McCloskey
    • 1
  • J. A. Kanis
    • 1
  1. 1.WHO Collaborating Centre for Metabolic Bone DiseasesUniversity of Sheffield Medical SchoolSheffieldUK

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