Strain energy density distribution of vertebral body of two motion segment model under combined compression and sagittal bending moment–an in vitro porcine spine biomechanical study
Journal
Journal of the Chinese Institute of Engineers, Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Journal Volume
27
Journal Issue
6
Pages
929-936
Date Issued
2004
Author(s)
Abstract
Abstract The purpose of the current study is to find the strain energy density (SED) distribution of a vertebral body during different compression loadings, combined with sagittal bending moments. The combined flexion and extension, which are generated by applying an eccentric pointed loading on the motion segment, is to mimic different postures of trunk and loading on the spine. Two strain gage rosettes were applied at an anterior site and a posterior site of a vertebral body. The total SED, deviatoric SED and dilatation SED were obtained from the measurements of the two rosettes. Three major phenomena are observed in the current study; first, the anterior site on the vertebra is at higher risk compared to the posterior site on the vertebra when the motion segment is in compression combined with extreme flexion and extension. Second, the SED is minimal when the loading is applied along the trajectories of the spinal canal and joint facets. Third, the major contribution to SED is from the deviatoric SED. The distribution of SED within the vertebral body during different loading conditions can serve as the baseline for treatment to protect the vertebral body from the risk of compression fracture.
SDGs
Type
journal article
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