Biomechanical testing of microdamage formation in trabecular bone under compressive loads

Toal, Victoria R. & Adam, Clayton J. (2007) Biomechanical testing of microdamage formation in trabecular bone under compressive loads. In The Adelaide Centre for Spinal Research - Spinal Research Symposium V, 28-30 August 2007, Adelaide, Australia.


Mechanical properties of trabecular bone, most commonly its elastic modulus, have been investigated through a variety of techniques during the last thirty years, from analysis of individual struts to its behaviour at the macroscopic level(1). An area of significant interest in determining its failure characteristics is microdamage; that is, microscopic cracks that occur in both physiologically normal and degraded bone, presenting as cross-hatching, diffuse damage, micro-cracking and , ultimately, micro-fracture (2). Improved understanding of the microstructural failure mechanisms of trabecular bone may have clinical relevance in the aetiology and treatment of bone diseases such as osteoporosis, and for bone behaviour at fracture and artificial implant sites. The purpose of this study was to investigate failure mechanisms of trabecular bone at the microstructural level during plane strain uniaxial compression testing of thin bone sections. The technique used in this study allows real-time comparison of apparent stress and strain mesurements with images while providing imaging capabilities that are of a spatial resolution comparable to micro-computed tomography. The effect of friction is recognised as an area that requires careful consideration in the analysis of results. The testing procedure achieved thus far shows potential for further development and with careful validation, could allow investigation into a range of influences in the formation of microdamage in trabecular bone, such as strain rate, loading direction, bone composition, cyclic and impact loading. Future applications would also involve contributing to the validation of finite element modelling of trabecular bone.

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ID Code: 13852
Item Type: Conference Paper
Refereed: Yes
Keywords: mechanical properties, trabecular bone, microdamage, microfracture, osteoporosis
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2007 (please consult author)
Deposited On: 24 Jun 2008 00:00
Last Modified: 09 Jun 2010 13:00

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