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High-speed photography of the development of microdamage in trabecular bone during compression

Published online by Cambridge University Press:  01 May 2006

Philipp J. Thurner ,
Blake Erickson ,
Zachary Schriock ,
John Langan ,
Jeff Scott ,
Maria Zhao ,
James C. Weaver ,
Georg E. Fantner ,
Patricia Turner  and
Johannes H. Kindt
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Philipp J. Thurner*
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, CA 93106
Blake Erickson
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, CA 93106
Zachary Schriock
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, CA 93106
John Langan
Affiliation:
Computational Sensors Corp., Santa Barbara, California 93103
Jeff Scott
Affiliation:
Computational Sensors Corp., Santa Barbara, California 93103
Maria Zhao
Affiliation:
Computational Sensors Corp., Santa Barbara, California 93103
James C. Weaver
Affiliation:
Department of Molecular, Cellular and Developmental Biology, University of California–Santa Barbara, Santa Barbara, California 93106
Georg E. Fantner
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, California 93106
Patricia Turner
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, California 93106
Johannes H. Kindt
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, California 93106
Georg Schitter
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, California 93106
Daniel E. Morse
Affiliation:
Department of Molecular, Cellular and Developmental Biology, University of California–Santa Barbara, Santa Barbara, California 93106
Paul K. Hansma
Affiliation:
Physics Department, University of California–Santa Barbara, Santa Barbara, California 93106
*
a) Address all correspondence to this author. e-mail: [email protected] This paper was selected as the Outstanding Meeting Paper for the 2005 MRS Spring Meeting Symposium L Proceedings, Vol. 874.
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Abstract

The mechanical properties of healthy and diseased bone tissue were extensively studied in mechanical tests. Most of this research was motivated by the immense costs of health care and social impacts due to osteoporosis in post-menopausal women and the aged. Osteoporosis results in bone loss and change of trabecular architecture, causing a decrease in bone strength. To address the problem of assessing local failure behavior of bone, we combined mechanical compression testing of trabecular bone samples with high-speed photography. In this exploratory study, we investigated healthy, osteoarthritic, and osteoporotic human vertebral trabecular bone compressed at high strain rates. Apparent strains were found to transfer into to a broad range of local strains. Strained trabeculae were seen to whiten with increasing strain. Comparison of whitened regions seen in high-speed photography sequences with scanning electron micrographs showed that the observed whitening was due to the formation of microcracks. From the results of a motion energy filter applied to the recorded movies, we saw that the whitened areas are, presumably, also areas of high deformation. In summary, high-speed photography allows the detection of microdamage in real time, leading toward a better understanding of the local processes involved in bone failure.

Keywords

BoneFractureStress/strain relationship
Type
Outstanding Meeting Papers
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1093 - 1100
Copyright
Copyright © Materials Research Society 2006

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References

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