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Strain changes on the cortical shell of vertebral bodies due to spine ageing: a parametric study using a finite element model evaluated by strain measurements
Citation Link: https://doi.org/10.15480/882.1595
Publikationstyp
Journal Article
Date Issued
2013
Sprache
English
Institut
TORE-DOI
Volume
227
Issue
12
Start Page
1265
End Page
1274
Citation
Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine 12 (227): 1265-1274 (2013-12)
Publisher DOI
Scopus ID
The probability of fractures of the cortical shell of vertebral bodies increases as ageing progresses. Ageing involves all the spinal component changes. However, the effect of the spinal component ageing on the fracture risk of the cortical shell remains poorly understood. In this study, the influence of the ageing of the spinal components on cortical shell strain was investigated. A lumbar spinal specimen (L3-L5) was mechanically tested under a quasi-static axial compressive load. Clinical computed tomography images of the same specimen were used to create a corresponding finite element model. The material properties were determined by calibrating the finite element model using the L4 cortical shell strains of the anterior centre measurement site. The remaining experiment data (axial displacement, the intra-discal pressures, L4 cortical shell strain on the lateral measurement site) were used to evaluate the model. The individual ageing process of the six spinal components (cortical shell, cancellous bone, bony endplate, posterior elements, nucleus pulposus and annulus matrix) was simulated by changing their Young's moduli and Poisson's ratios, and the effect on cortical shell strain was investigated. Results show that the cortical shell strain is more sensitive to the ageing of the cortical shell and the cancellous bone than to the ageing of the nucleus pulposus, the annulus matrix, and the bony endplates and of the posterior elements. The results can help the clinicians focus on the aspects that mainly influence the vertebral cortex fracture risk factor.
Subjects
Finite element modelling
cortical shell
lumbar spine
principal strain
spinal ageing
Adult
Aging
Compressive Strength
Computer Simulation
Elastic Modulus
Finite Element Analysis
Humans
Lumbar Vertebrae
Male
Stress, Mechanical
Tensile Strength
Models, Biological
DDC Class
610: Medizin
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