NDLI: Spinal cord deformation in flexion and extension-a finite element study

Content Provider	IEEE Xplore Digital Library
Author	Seifert, J. Totoribe, K. Goel, V. Traynelis, C. Clark, C.
Copyright Year	2000
Description	Author affiliation: Iowa Spine Res. Center, Iowa Univ., Iowa City, IA, USA (Seifert, J.)
Abstract	Several spinal disorders and traumatic loading situations are known to inflict damage to neurovascular components of the cervical spinal cord. An understanding of physiologic cervical spinal cord deformation is important for defining an injury threshold of the cervical spinal cord. Studies have shown that damage to the spinal cord can occur regardless of significant damage to surrounding structures. To understand the mechanics of spinal cord injury, one needs to quantify stresses and strains within the spinal cord and its components in response to external loads applied to the bony spine. Experimental studies can not address this issue. This study presents a finite element (FE) model to quantify the physiologic strains and stresses within the cervical spinal cord at the C5-C6 level. A ligamentous nonlinear three-dimensional FE model of the C5-C6 motion segment was developed from 1.5 mm thick serial computed tomography (CT) scan. The trend of the strain data indicates that the posterior surface of the cord was strained more than the anterior surface during flexion, which is in agreement with the data from Yuan et al. (1998). Also, the von Mises stress plots indicate an increase in stress on the dural sheath during flexion due to disc bulging. This model represents the first attempt the authors are aware of to quantify stress and strain in the spinal cord during physiologic spinal loading using a three-dimensional FE cervical spine model with spinal cord. Limitations of the spinal cord model include material property and boundary definitions, as well as the inclusion of fatty layers and other connective tissues around the cord in the canal.
Starting Page	855
Ending Page	856
File Size	212422
Page Count	2
File Format	PDF
ISBN	0780364651
ISSN	1094687X
DOI	10.1109/IEMBS.2000.897850
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-07-23
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spinal cord Finite element methods Capacitive sensors Stress Predictive models Solid modeling Cities and towns Spine Computed tomography Irrigation
Content Type	Text
Resource Type	Article

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