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A pilot finite element study of an osteoporotic L1-vertebra compared to one with normal T-score

Author

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  • C. Provatidis
  • C. Vossou
  • I. Koukoulis
  • A. Balanika
  • C. Baltas
  • G. Lyritis

Abstract

In this paper, two patient-specific finite element (FE) models of both an L1 vertebra with a normal T-score and a mildly wedging, osteoporotic one were created and analysed under usual action. Utilising commercial software packages for image processing and FE analysis (FEA) along with in house computer codes for a posteriori assignment of material properties, in vivo high-resolution spiral computed tomography of the entire vertebrae and FEA were combined. Using the vertebra with a normal T-score as baseline it was found that the maximum value of the von Mises stress in the osteoporotic vertebra was 60% higher but still far below bone strength, while the maximum value of von Mises strain in the same vertebra was 148% higher than that of the vertebra with normal T-score. In the vertebra with normal T-score, 17% of its volume exhibited values of von Mises strain higher than the threshold of 4500 μstrains, referenced by Homminga et al. as a threshold of fracture risk, while in the osteoporotic one this percentage was raised up to 37%. The results suggested that the osteoporotic vertebra is susceptible to fracture due to raised strains and not stresses.

Suggested Citation

  • C. Provatidis & C. Vossou & I. Koukoulis & A. Balanika & C. Baltas & G. Lyritis, 2010. "A pilot finite element study of an osteoporotic L1-vertebra compared to one with normal T-score," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 13(2), pages 185-195.
    • Handle: RePEc:taf:gcmbxx:v:13:y:2010:i:2:p:185-195
    DOI: 10.1080/10255840903099703
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