title: Comparison of specimen-specific vertebral body finite element models with experimental digital image correlation measurements.
abstract: The purpose of this study was to load cadaveric vertebral bodies (n=6) in compression and compare the response, measured with digital image correlation (DIC) on the cortex, with the predicted response from specimen-specific vertebral finite element (FE) models. Five modulus-density relationships were evaluated, and for the strongest modulus-density relationship, the correlation between the DIC and FE displacements had R2values from 0.75 to 0.93. The stiffnesses derived from the DIC measurements were strongly predicted by the FE stiffnesses (R2=0.90). DIC provides full-field measurements of surface displacement, eliminating the influence of system compliance, for validation of specimen-specific models.
authors: Mechanical Engineering, University of British Columbia, 818 W. 10th Ave., Vancouver, BC, Canada V5Z 1M9. Electronic address: hgustafs@interchange.ubc.ca.
authors: Hannah M
authors: HM
authors: Gustafson
authors: Mechanical Engineering, University of British Columbia, 818 W. 10th Ave., Vancouver, BC, Canada V5Z 1M9. Electronic address: cripton@mech.ubc.ca.
authors: Peter A
authors: PA
authors: Cripton
authors: Institute for Biomechanics, ETH-Zürich, HPP-O22, Hönggerbergring 64, CH-8093 Zürich, Switzerland. Electronic address: sferguson@ethz.ch.
authors: Stephen J
authors: SJ
authors: Ferguson
authors: Institute for Biomechanics, ETH-Zürich, HPP-O22, Hönggerbergring 64, CH-8093 Zürich, Switzerland. Electronic address: bhelgason@ethz.ch.
authors: Benedikt
authors: B
authors: Helgason
mesh_terms: D002102:Cadaver; D055119:Elastic Modulus; D020342:Finite Element Analysis; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D013131:Spine / Q000502:physiology*
keywords: Compression; Digital image correlation; Finite element modeling; Specimen-specific; Vertebra