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RESEARCH PAPERS: Other Research Papers

Nonlinear Analysis of Intervertebral Disk Under Dynamic Load

[+] Author and Article Information
A. Natali, E. Meroi

Università degli Studi di Padova, Instituto di Scienza e Tecnica delle Construzioni, 35131 Padova, Italy

J Biomech Eng 112(3), 358-363 (Aug 01, 1990) (6 pages) doi:10.1115/1.2891196 History: Received January 12, 1989; Revised March 30, 1990; Online March 17, 2008

Abstract

This study pertains to the response of intervertebral joint under dynamic axial load. The numerical model represents two vertebral bodies with an interposed disk and uses three-dimensional elements. A transversely isotropic material law is adopted for cortical bone and an isotropic law for cancellous bone. Annulus collagen fibers are modelled using truss elements with no compressive resistance. The disk material is assumed hyperelastic, using a mixed finite element approach, allowing a representation of the disk involving the incompressibility characteristics for the material. The analysis considers finite displacement and strain fields under dynamic load. Intensity, trend and distribution of loads on the vertebral body are deduced from the literature. The problem is investigated with reference to different compressibility levels of disk material related to disk degeneration phenomena.

Copyright © 1990 by The American Society of Mechanical Engineers
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