MR-based measurement of spinal cord motion during flexion of the spine: implications for intradural spinal cord stimulator systems

S Viljoen; C. A Smittkamp; B. D Dalm; S Wilson; C. G Reddy; G. T Gillies; M. A Howard

doi:10.3109/03091902.2013.844207

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MR-based measurement of spinal cord motion during flexion of the spine: implications for intradural spinal cord stimulator systems

Journal article

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MR-based measurement of spinal cord motion during flexion of the spine: implications for intradural spinal cord stimulator systems

S Viljoen, C. A Smittkamp, B. D Dalm, S Wilson, C. G Reddy, G. T Gillies and M. A Howard

Journal of medical engineering & technology, Vol.38(1), pp.1-4

01/01/2014

DOI: 10.3109/03091902.2013.844207

PMID: 24144117

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Abstract

This study develops a means of delivering electrical stimuli directly to the pial surface of the spinal cord for treatment of intractable pain. This intradural implant must remain in direct contact with the cord as it moves within the spinal canal. Therefore, magnetic resonance imaging was used to measure the movement of the spinal cord between neutral and flexed-back positions in a series of volunteers (n = 16). Following flexion of the back, the mean change in the pedicle-to-spinal cord dorsal root entry zone distance at the T10-11 level was (8.5 ± 6.0) mm, i.e. a 71% variation in the range of rostral-caudal movement of the spinal cord across all patients. There will be a large spectrum of spinal cord strains associated with this observed range of rostral-caudal motions, thus calling for suitable axial compliance within the electrode bearing portion of the intradural implant.

neuromodulation

spinal cord stimulator

intradural implants

spinal cord

Dorsal root entry zone

Details

Title: Subtitle: MR-based measurement of spinal cord motion during flexion of the spine: implications for intradural spinal cord stimulator systems
Creators: S Viljoen - Department of Neurosurgery
C. A Smittkamp - Department of Radiology, University of Iowa Hospitals and Clinics
B. D Dalm - Department of Neurosurgery
S Wilson - Department of Neurosurgery
C. G Reddy - Department of Neurosurgery
G. T Gillies - Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville
M. A Howard - Department of Neurosurgery
Resource Type: Journal article
Publication Details: Journal of medical engineering & technology, Vol.38(1), pp.1-4
Publisher: Taylor & Francis
DOI: 10.3109/03091902.2013.844207
PMID: 24144117
ISSN: 0309-1902
eISSN: 1464-522X
Language: English
Date published: 01/01/2014
Academic Unit: Neurology; Iowa Neuroscience Institute; Neurosurgery; Otolaryngology
Record Identifier: 9984020757902771

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