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Bone. 2013 Oct;56(2):327-36. doi: 10.1016/j.bone.2013.05.023. Epub 2013 Jun 10.

Biomechanical properties and microarchitecture parameters of trabecular bone are correlated with stochastic measures of 2D projection images.

Author information

  • 1Department of Health and Kinesiology, The University of Texas at Tyler, Tyler, TX 75799, USA. ndong@uttyler.edu

Abstract

It is well known that loss of bone mass, quantified by areal bone mineral density (aBMD) using DXA, is associated with the increasing risk of bone fractures. However, bone mineral density alone cannot fully explain changes in fracture risks. On top of bone mass, bone architecture has been identified as another key contributor to fracture risk. In this study, we used a novel stochastic approach to assess the distribution of aBMD from 2D projection images of Micro-CT scans of trabecular bone specimens at a resolution comparable to DXA images. Sill variance, a stochastic measure of distribution of aBMD, had significant relationships with microarchitecture parameters of trabecular bone, including bone volume fraction, bone surface-to-volume ratio, trabecular thickness, trabecular number, trabecular separation and anisotropy. Accordingly, it showed significantly positive correlations with strength and elastic modulus of trabecular bone. Moreover, a combination of aBMD and sill variance derived from the 2D projection images (R2=0.85) predicted bone strength better than using aBMD alone (R2=0.63). Thus, it would be promising to extend the stochastic approach to routine DXA scans to assess the distribution of aBMD, offering a more clinically significant technique for predicting risks of bone fragility fractures.

Published by Elsevier Inc.

KEYWORDS:

DXA; Distribution of areal bone mineral density; Experimental variogram; Sill variance; Trabecular bone

PMID:
23756232
[PubMed - indexed for MEDLINE]
PMCID:
PMC3755113
Free PMC Article
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