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Osteoporosis International

Erschienen in:

01.03.2013 | Original Article

The effect of intravertebral heterogeneity in microstructure on vertebral strength and failure patterns

verfasst von: A. I. Hussein, E. F. Morgan

Erschienen in: Osteoporosis International | Ausgabe 3/2013

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Abstract

Summary

The goal of this study was to determine the influence of intravertebral heterogeneity in microstructure on vertebral failure. Results show that noninvasive assessments of the intravertebral heterogeneity in density improve predictions of vertebral strength and that local variations in microstructure are associated with locations of failure in the vertebral body.

Introduction

The overall goal of this study was to determine the influence of intravertebral heterogeneity in microstructure on vertebral failure.

Methods

Trabecular density and microarchitecture were quantified for 32 thoracic vertebrae using micro-computed tomography (μCT)-based analyses of 4.81 mm, contiguous cubes throughout the centrum. Intravertebral heterogeneity in density was defined as the interquartile range and quartile coefficient of variation of the cube densities. The vertebrae were compressed to failure to measure stiffness, strength, and toughness. Pre- and post-compression μCT images were analyzed using digital volume correlation to quantify failure patterns in the vertebrae, as defined by the distributions of residual strain.

Results

Failure patterns consisted of large deformations in the midtransverse plane with concomitant endplate biconcavity and were linked to the intravertebral distribution of bone tissue. Low values of connectivity density and trabecular number, and high values of trabecular separation, were associated with high strains. However, local microstructural properties were not the sole determinants of failure. For instance, the midtransverse plane experienced the highest strain (p < 0.008) yet had the highest density, lowest structure model index, and lowest anisotropy (p < 0.013). Accounting for the intravertebral heterogeneity in density improved predictions of strength and stiffness as compared to predictions based only on mean density (strength: R ² = 0.75 vs. 0.61, p < 0.001; stiffness: R ² = 0.44 vs. 0.26, p = 0.001).

Conclusions

Local variations in microstructure are associated with failure patterns in the vertebra. Noninvasive assessments of the intravertebral heterogeneity in density—which are feasible in clinical settings—can improve predictions of vertebral strength and stiffness.

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Titel: The effect of intravertebral heterogeneity in microstructure on vertebral strength and failure patterns
verfasst von: A. I. Hussein
E. F. Morgan
Publikationsdatum: 01.03.2013
Verlag: Springer-Verlag
Erschienen in: Osteoporosis International / Ausgabe 3/2013
Print ISSN: 0937-941X
Elektronische ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-012-2039-1

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