Structural Models for Human Spinal Motion Segments Based on a Poroelastic View of the Intervertebral Disk

[+] Author and Article Information
B. R. Simon, J. S. S. Wu, M. W. Carlton

Aerospace and Mechanical Engineering, University of Arizona, Tucson, Ariz. 85721

J. H. Evans

Bioengineering Unit, Strathclyde University, Glasgow, Scotland, U.K.

L. E. Kazarian

AFAMRL/BBD, Wright Patterson AFB, Dayton, Ohio 45433

J Biomech Eng 107(4), 327-335 (Nov 01, 1985) (9 pages) doi:10.1115/1.3138565 History: Received January 02, 1985; Revised July 19, 1985; Online June 15, 2009


Analytical and finite element models (FEMs) were used to quantify poroelastic material properties for a human intervertebral disk. An axisymmetric FEM based on a poroelastic view of disk constituents was developed for a representative human spinal motion segment (SMS). Creep and steady-state response predicted by FEMs agreed with experimental observations, i.e., long-time creep occurs with flow in the SMS, whereas for rapid steady-state loading an “undrained,” nearly incompressible response is evident. A relatively low value was determined for discal permeability. Transient and long-term creep FE analyses included the study of deformation, pore fluid flow, stress, and pore fluid pressure. Relative fluid motion associated with transient creep is related to nuclear nutrition and the overall mechanical response in the normal disk. Degeneration of the disk may be associated, with an increase in permeability.

Copyright © 1985 by ASME
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