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High-speed photography of compressed human trabecular bone correlates whitening to microscopic damage

Record type: Article

Mechanical testing of trabecular bone is mainly motivated by the huge impact of osteoporosis in post-menopausal women and the aged in society in terms of social and health care costs. Trabecular bone loss and impairment of its mechanical properties reduce bone strength and increase fracture risk, especially in vertebrae. It is generally accepted that in addition to bone mineral density, microarchitecture and material properties of bone also play important roles for bone strength and fracture risk. In order to overcome the limitations of standard mechanical tests delivering merely integral information about complicated samples, experiments were designed for step-wise mechanical testing with concurrent imaging of trabecular and cortical bone. In this communication we present an approach for real-time imaging of trabecular bone during compression using high-speed photography and investigate the hypothesis whether the whitening of deformed trabeculae is due to microdamage. Experiments on human trabecular bone samples from a healthy male donor revealed that failure of such samples is highly localized in fracture bands. Moreover, strongly deformed trabeculae were seen to whiten, an effect similar to stress whitening in polymers. Scanning Electron Microscopy of the same regions of interest revealed that whitened trabeculae were strongly damaged by microscopic cracks and mostly failed in delamination. Higher resolution images uncovered mineralized collagen fibrils spanning the cracks. The whitening partially faded after unloading of the samples, presumably due to partial crack closure. Overall, high-speed photography enables microdamage detection in real-time during a mechanical test and provides a correlation to recorded stress strain curves.

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Citation

Thurner, Philipp J., Erickson, Blake, Jungmann, Ralf, Schriock, Zachary, Weaver, James C., Fantner, Georg E., Schitter, Georg, Morse, Daniel E. and Hansma, Paul K. (2007) High-speed photography of compressed human trabecular bone correlates whitening to microscopic damage Engineering Fracture Mechanics, 74, (12), pp. 1928-1941. (doi:10.1016/j.engfracmech.2006.05.024).

More information

Published date: August 2007
Keywords: trabecular bone, fracture, high-speed photography, stress-whitening, microdamage, delamination

Identifiers

Local EPrints ID: 48331
URI: http://eprints.soton.ac.uk/id/eprint/48331
ISSN: 0013-7944
PURE UUID: 698f63fa-cde4-4d45-81ef-bde58a00e3a5

Catalogue record

Date deposited: 12 Sep 2007
Last modified: 17 Jul 2017 15:00

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Contributors

Author: Blake Erickson
Author: Ralf Jungmann
Author: Zachary Schriock
Author: James C. Weaver
Author: Georg E. Fantner
Author: Georg Schitter
Author: Daniel E. Morse
Author: Paul K. Hansma

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