Comparison of specimen-specific vertebral body finite element models with experimental digital image correlation measurements. (January 2017)

• Record Type: Journal Article
• Authors: Gustafson, Hannah M.; Cripton, Peter A.; Ferguson, Stephen J.; Helgason, Benedikt
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 65(2017)
• Page Start: 801
• Page End: 807
• Publication Date: 2017-01
• Subjects: Digital image correlation -- Vertebra -- Compression -- Specimen-specific -- Finite element modeling; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2016.10.002
• Languages: English
• ISSNs: 1751-6161

Abstract

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 R 2 values from 0.75 to 0.93. The stiffnesses derived from the DIC measurements were strongly predicted by the FE stiffnesses (R 2 =0.90). DIC provides full-field measurements of surface displacement, eliminating the influence of system compliance, for validation of specimen-specific models.