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Finite element stress analysis of an intervertebral disc.

Authors
Belytschko-T; Kulak-RF; Schultz-AB; Galante-JO
Source
J Biomech 1974 May; 7(3):277-285
NIOSHTIC No.
00043571
Abstract
An axisymmetric finite element model is employed for the study of the behavior of an intervertebral disc under axial loading. By matching experimental results on the overall behavior of the disc, orthotropic linear material constants are obtained for the annulus fibrosis for various load levels. Results are then presented on the effects of material properties and geometry on the stress- distribution and intradiscal pressures. It is shown that: (1) an adequate representation of disc behavior requires the inclusion of material anisotropy; (2) material properties of the annulus obtained by direct measurement underestimate the stiffness of the material; (3) reasonable predictions of variations of disc stiffness with vertebral level can be made on the basis of geometry; and (4) degenerative changes associated with loss of elasticity have little effect on the intradiscal pressure, while annular tears result in reduced pressure in agreement with clinical observations.
Keywords
NIOSH-Publication; NIOSH-Grant; Osteology; Physics; Physiology; Anatomy; Bones; Vertebrae; Spines
Contact
Materials Engineering University of Illinois Dept of Materials Engr, Bx4348 Chicago, Ill 60680
CODEN
JBMCB5
Publication Date
19740501
Document Type
Journal Article
Funding Amount
663463
Funding Type
Grant
Fiscal Year
1974
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-000514
Issue of Publication
3
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
IL
Performing Organization
University of Illinois Chicago Circle, Chicago, Illinois
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