Published in

American Society of Mechanical Engineers, Journal of Biomechanical Engineering, 1(137), 2015

DOI: 10.1115/1.4028991

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Inverse Finite Element Modeling for Characterization of Local Elastic Properties in Image-Guided Failure Assessment of Human Trabecular Bone

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The local interpretation of microfinite element (mu FE) simulations plays a pivotal role for studying bone structure-function relationships such as failure processes and bone remodeling. In the past mu FE simulations have been successfully validated on the apparent level however, at the tissue level validations are sparse and less promising. Furthermore, intratrabecular heterogeneity of the material properties has been shown by experimental studies. We proposed an inverse mu FE algorithm that iteratively changes the tissue level Young's moduli such that the mu FE simulation matches the experimental strain measurements. The algorithm is setup as a feedback loop where the modulus is iteratively adapted until the simulated strain matches the experimental strain. The experimental strain of human trabecular bone specimens was calculated from time-lapsed images that were gained by combining mechanical testing and synchrotron radiation microcomputed tomography (SR mu CT). The inverse mu FE algorithm was able to iterate the heterogeneous distribution of moduli such that the resulting mu FE simulations matched artificially generated and experimentally measured strains. ; Peer reviewed