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The Effect of Lateral Eccentricity on Failure Loads, Kinematics, and Canal Occlusions of the Cervical Spine in Axial Loading Van Toen, C.; Street, John T.; Oxland, Thomas R.; Cripton, Peter Alec, 1965-

Abstract

Current neck injury criteria do not include limits for lateral bending combined with axial compression and this has been observed as a clinically relevant mechanism, particularly for rollover motor vehicle crashes. The primary objectives of this study were to evaluate the effects of lateral eccentricity (the perpendicular distance from the axial force to the centre of the spine) on peak loads, kinematics, and spinal canal occlusions of subaxial cervical spine specimens tested in dynamic axial compression (0.5 m/s). Twelve 3-vertebra human cadaver cervical spine specimens were tested in two groups: low and high eccentricity with initial eccentricities of 1% and 150% of the lateral diameter of the vertebral body. Six-axis loads inferior to the specimen, kinematics of the superior-most vertebra, and spinal canal occlusions were measured. High speed video was collected and acoustic emission (AE) sensors were used to define the time of injury. The effects of eccentricity on peak loads, kinematics, and canal occlusions were evaluated using unpaired Student t-tests. The high eccentricity group had lower peak axial forces (1544 ±629 vs. 4296 ±1693 N), inferior displacements (0.2 ±1.0 vs. 6.6 ±2.0 mm), and canal occlusions (27 ±5 vs. 53 ±15%) and higher peak ipsilateral bending moments (53 ±17 vs. 3 ±18 Nm), ipsilateral bending rotations (22 ±3 vs. 1 ±2o), and ipsilateral displacements (4.5 ±1.4 vs. -1.0 ±1.3 mm, p<0.05 for all comparisons). These results provide new insights to develop prevention, recognition, and treatment strategies for compressive cervical spine injuries with lateral eccentricities.

Item Metadata

Title
The Effect of Lateral Eccentricity on Failure Loads, Kinematics, and Canal Occlusions of the Cervical Spine in Axial Loading
Creator
Van Toen, C.; Street, John T.; Oxland, Thomas R.; Cripton, Peter Alec, 1965-
Contributor
B.C. Injury Research and Prevention Unit; University of British Columbia. Orthopaedic and Injury Biomechanics Group; ICORD (University of British Columbia. Faculty of Medicine); University of British Columbia. Department of Orthopaedics. Combined Neurosurgical & Orthopaedic Spine Program
Publisher
International Society of Biomechanics
Date Issued
2014-03-21
Description
Current neck injury criteria do not include limits for lateral bending combined with axial compression and this has been observed as a clinically relevant mechanism, particularly for rollover motor vehicle crashes. The primary objectives of this study were to evaluate the effects of lateral eccentricity (the perpendicular distance from the axial force to the centre of the spine) on peak loads, kinematics, and spinal canal occlusions of subaxial cervical spine specimens tested in dynamic axial compression (0.5 m/s). Twelve 3-vertebra human cadaver cervical spine specimens were tested in two groups: low and high eccentricity with initial eccentricities of 1% and 150% of the lateral diameter of the vertebral body. Six-axis loads inferior to the specimen, kinematics of the superior-most vertebra, and spinal canal occlusions were measured. High speed video was collected and acoustic emission (AE) sensors were used to define the time of injury. The effects of eccentricity on peak loads, kinematics, and canal occlusions were evaluated using unpaired Student t-tests. The high eccentricity group had lower peak axial forces (1544 ±629 vs. 4296 ±1693 N), inferior displacements (0.2 ±1.0 vs. 6.6 ±2.0 mm), and canal occlusions (27 ±5 vs. 53 ±15%) and higher peak ipsilateral bending moments (53 ±17 vs. 3 ±18 Nm), ipsilateral bending rotations (22 ±3 vs. 1 ±2o), and ipsilateral displacements (4.5 ±1.4 vs. -1.0 ±1.3 mm, p<0.05 for all comparisons). These results provide new insights to develop prevention, recognition, and treatment strategies for compressive cervical spine injuries with lateral eccentricities.
Subject
cervical spine; spinal canal occlusion; acoustic emission; lateral bending; biomechanics
Genre
Article; Preprint
Type
Text
Language
eng
Date Available
2021-02-26
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International
DOI
10.14288/1.0395969
URI
http://hdl.handle.net/2429/77411
Affiliation
Applied Science, Faculty of; Medicine, Faculty of; Mechanical Engineering, Department of; Orthopaedic Surgery, Department of
Citation
Van Toen C, Melnyk AD, Street J, Oxland TR, Cripton PA. The effect of lateral eccentricity on failure loads, kinematics, and canal occlusions of the cervical spine in axial loading. J Biomech. 2014 Mar 21;47(5):1164-72.
Publisher DOI
10.1016/j.jbiomech.2013.12.001
Peer Review Status
Unreviewed
Scholarly Level
Faculty
Rights URI
http://creativecommons.org/licenses/by/4.0/
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Attribution 4.0 International