Osteoporosis International

, Volume 25, Issue 2, pp 559–566 | Cite as

The associations between QCT-based vertebral bone measurements and prevalent vertebral fractures depend on the spinal locations of both bone measurement and fracture

  • D. E. Anderson
  • S. Demissie
  • B. T. Allaire
  • A. G. Bruno
  • D. L. Kopperdahl
  • T. M. Keaveny
  • D. P. Kiel
  • M. L. Bouxsein
Original Article

Abstract

Summary

We examined how spinal location affects the relationships between quantitative computed tomography (QCT)-based bone measurements and prevalent vertebral fractures. Upper spine (T4–T10) fractures appear to be more strongly related to bone measures than lower spine (T11–L4) fractures, while lower spine measurements are at least as strongly related to fractures as upper spine measurements.

Introduction

Vertebral fracture (VF), a common injury in older adults, is most prevalent in the mid-thoracic (T7–T8) and thoracolumbar (T12–L1) areas of the spine. However, measurements of bone mineral density (BMD) are typically made in the lumbar spine. It is not clear how the associations between bone measurements and VFs are affected by the spinal locations of both bone measurements and VF.

Methods

A community-based case–control study includes 40 cases with moderate or severe prevalent VF and 80 age- and sex-matched controls. Measures of vertebral BMD, strength (estimated by finite element analysis), and factor of risk (load:strength ratio) were determined based on QCT scans at the L3 and T10 vertebrae. Associations were determined between bone measures and prevalent VF occurring at any location, in the upper spine (T4–T10), or in the lower spine (T11–L4).

Results

Prevalent VF at any location was significantly associated with bone measures, with odds ratios (ORs) generally higher for measurements made at L3 (ORs = 1.9–3.9) than at T10 (ORs = 1.5–2.4). Upper spine fracture was associated with these measures at both T10 and L3 (ORs = 1.9–8.2), while lower spine fracture was less strongly associated (ORs = 1.0–2.4) and only reached significance for volumetric BMD measures at L3.

Conclusions

Closer proximity between the locations of bone measures and prevalent VF does not strengthen associations between bone measures and fracture. Furthermore, VF etiology may vary by region, with VFs in the upper spine more strongly related to skeletal fragility.

Keywords

Biomechanics Bone strength Finite element analysis Fracture prediction Osteoporosis 

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2013

Authors and Affiliations

  • D. E. Anderson
    • 1
    • 2
  • S. Demissie
    • 3
  • B. T. Allaire
    • 1
  • A. G. Bruno
    • 1
    • 4
  • D. L. Kopperdahl
    • 5
  • T. M. Keaveny
    • 5
    • 6
  • D. P. Kiel
    • 7
    • 8
  • M. L. Bouxsein
    • 1
    • 2
  1. 1.Center for Advanced Orthopaedic StudiesBeth Israel Deaconess Medical CenterBostonUSA
  2. 2.Department of Orthopedic SurgeryHarvard Medical SchoolBostonUSA
  3. 3.Department of BiostatisticsBoston University School of Public HealthBostonUSA
  4. 4.Harvard-MIT Health Sciences and Technology ProgramCambridgeUSA
  5. 5.ON DiagnosticsBerkeleyUSA
  6. 6.Departments of Mechanical Engineering and BioengineeringUniversity of CaliforniaBerkeleyUSA
  7. 7.Institute for Aging ResearchHebrew SeniorLifeBostonUSA
  8. 8.Department of Medicine, Harvard Medical School and Division of GerontologyBeth Israel Deaconess Medical CenterBostonUSA

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