| A patient-specific computer tomography-based finite element methodology to calculate the six dimensional stiffness matrix of human vertebral bodies. | |
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MedLine Citation:
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PMID: 22757494 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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In most finite element (FE) studies of vertebral bodies, axial compression is the loading mode of choice to investigate structural properties, but this might not adequately reflect the various loads to which the spine is subjected during daily activities or the increased fracture risk associated with shearing or bending loads. This work aims at proposing a patient-specific computer tomography (CT)-based methodology, using the currently most advanced, clinically applicable finite element approach to perform a structural investigation of the vertebral body by calculation of its full six dimensional (6D) stiffness matrix. FE models were created from voxel images after smoothing of the peripheral voxels and extrusion of a cortical shell, with material laws describing heterogeneous, anisotropic elasticity for trabecular bone, isotropic elasticity for the cortex based on experimental data. Validated against experimental axial stiffness, these models were loaded in the six canonical modes and their 6D stiffness matrix calculated. Results show that, on average, the major vertebral rigidities correlated well or excellently with the axial rigidity but that weaker correlations were observed for the minor coupling rigidities and for the image-based density measurements. This suggests that axial rigidity is representative of the overall stiffness of the vertebral body and that finite element analysis brings more insight in vertebral fragility than densitometric approaches. Finally, this extended patient-specific FE methodology provides a more complete quantification of structural properties for clinical studies at the spine. |
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Authors:
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Yan Chevalier; Philippe K Zysset |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of biomechanical engineering Volume: 134 ISSN: 1528-8951 ISO Abbreviation: J Biomech Eng Publication Date: 2012 May |
Date Detail:
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Created Date: 2012-07-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7909584 Medline TA: J Biomech Eng Country: United States |
Other Details:
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Languages: eng Pagination: 051006 Citation Subset: IM |
Affiliation:
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Orthopedics Department, University Hospital Grosshadern, Laboratory for Biomechanics and Experimental Orthopedics, Marchioninistrasse 23, D- 81377 Munich, Germany; Institute of Lightweight Design and Structural Biomechanics, Gußhausstraße, 27-29, A-1040 Vienna, Austria. |
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