Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 5, Issue 1, Pages 231-237Publisher
ELSEVIER
DOI: 10.1016/j.jmbbm.2011.09.003
Keywords
Trabecular bone; Marrow; Mechanical parameters; Fluid flow
Funding
- International Campus on Safety and Intermodality in Transportation (CISIT)
- Nord-Pas-de-Calais Region
- European Community
- Regional Delegation for Research and Technology
- Ministry of Higher Education and Research
- National Center for Scientific Research (CNRS)
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The present paper focuses on the mechanical behavior analysis of bones at mesoscopic scale, paying a special attention to the trabecular bone and the bone marrow filling the porosities. Uni-axial quasi-static compression tests under unconfined conditions have been performed to identify the mechanical behavior of 46 trabecular bone samples. The bone marrow for 22 samples has been preserved to analyze the fluid flow effects on the crushing response. Although deformation patterns do not differ significantly, the average crush behavior of the trabecular bone shows an unexpected decrease of the mechanical properties when the marrow is kept in the sample (26% for the elastic modulus (E-a), 38% for the maximum compressive stress (sigma(max)) and 33% for the average stress (sigma(mean))). An explanation is given by analyzing the contribution of the bone marrow viscosity which smooths the mechanical response. A numerical analysis on an idealized trabecula confirms that the marrow induces transverse pressure and extra local stress on trabeculae during its flow, causing the premature collapse of the trabecular network. (C) 2011 Elsevier Ltd. All rights reserved.
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