Systems identification for material properties of the intervertebral joint

H. S. Lin, Y. King Lui, Gautam Ray, P. Nikravesh

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

An identification of the elastic solid properties of the intervertebral disc was achieved by the finite element method utilizing experimental data from the axial loading of a lumbar intervertebral joint. By assuming orthotropic material properties for the vertebra and disc, a 3-D finite element model resembling the test specimens was constructed and exercised. The model deformations were then compared to the experimental measurements and an initial correlation found between them. Finally, using an efficient optimization scheme, the overall material constants of the disc were optimally determined by minimizing the error between the experimental data and the predicted deformations from the finite element analysis. The material constants thus identified show the orthotropic elastic moduli of the lumbar intervertebral disc to be independent of segment level but decrease directly as a function of the severity of degeneration.

Original languageEnglish (US)
Pages (from-to)1-3,5-14
JournalJournal of Biomechanics
Volume11
Issue number1-2
DOIs
StatePublished - 1978
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

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