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A Novel Vertebral Stabilization Method for Producing Contusive Spinal Cord Injury
Published on: January 5, 2015
Coupling between the spinal cord and cervical vertebral column under tensile loading
Shannon G Kroeker1, Randal P Ching
1Applied Biomechanics Laboratory, Department of Mechanical Engineering, University of Washington, 501 Eastlake Ave E, Ste 102, Seattle, WA 98109, United States. shannon.kroeker@gmail.com
Journal of Biomechanics
|January 1, 2013
Summary
This study reveals that spinal cord injury (SCI) occurs at lower strain thresholds than vertebral column failure. Understanding this relationship is crucial for developing more accurate neck injury criteria.
Area of Science:
- Biomechanics
- Neuroscience
- Orthopedics
Background:
- Current neck injury metrics focus on vertebral column failure, neglecting spinal cord protection.
- Spinal cord injury (SCI) onset is a more relevant threshold for neck injury assessment.
Purpose of the Study:
- To investigate the relationship between cervical vertebral column and spinal cord strains under tensile loading.
- To establish a refined measure for neck injury thresholds based on SCI.
Main Methods:
- Utilized an in vitro primate model (n=10) subjected to continuous tensile loading.
- Measured axial strains in the cervical vertebral column and spinal cord.
- Calculated strain coupling ratios between C1 and C7.
Main Results:
- Mean failure load: 1951.5±396N; vertebral column failure strain: 16±5%.
- Average spinal cord tensile strain at failure: 11±5%.
- Mean strain coupling ratio (C1-C7): 0.54±0.17; peak spinal cord strain did not always align with vertebral failure location.
Conclusions:
- Spinal cord strains are consistently lower than vertebral column strains.
- Strain coupling ratios varied, with the highest at the atlanto-occipital joint and lowest at the C1-C2 joint.
- SCI onset provides a more sensitive indicator for neck injury than vertebral failure alone.
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