Mechanical testing setups affect spine segment fracture outcomes.
Biomechanical analysis
Flexion bending moment
Mechanical testing fixture
Spine fracture
Spine motion segment
Journal
Journal of the mechanical behavior of biomedical materials
ISSN: 1878-0180
Titre abrégé: J Mech Behav Biomed Mater
Pays: Netherlands
ID NLM: 101322406
Informations de publication
Date de publication:
12 2019
12 2019
Historique:
received:
17
04
2019
revised:
10
07
2019
accepted:
16
08
2019
pubmed:
4
9
2019
medline:
25
11
2020
entrez:
4
9
2019
Statut:
ppublish
Résumé
The purpose of the work presented here was to establish an experimental testing configuration that would generate a bending compression fracture in a laboratory setting. To this end, we designed and fabricated a fixture to accommodate a three level spine segment and to be able to perform mechanical testing by applying an off-centric compressive loading to create a flexion-type motion. Forces and moments occurring during testing were measured with a six-channel load cell. The initial testing configuration (Fixture A) included plates connected to the superior potted vertebral body and to the ball-socket joint of the testing system ram. Surprisingly, while all cadaveric specimens underwent a similar off-centric compressive loading, most of the specimens showed extension outcomes as opposed to the intended pure-flexion motion. The extension was due to fixture size and weight; by applying an off-centric load directly on the top plate, unintended large shear forces were generated. To resolve the issue, several modifications were made to the original fixture configuration. These modifications included the removal of the superior plates and the implementation of wedges at the superior surface of the fixture (Fixture B). A synthetic sample was used during this modification phase to minimize the number of cadaveric specimens while optimizing the process. The best outcomes were consistently observed when a 15°-wedge was used to provide flexion-type loading. Cadaveric specimens were then experimentally tested to fracture using the modified testing configuration (Fixture B). A comparison between both fixtures, A and B, revealed that almost all biomechanical parameters, including force, moment, and displacement data, were affected by the testing setup. These results suggest that fixture design and implementation for testing is of extreme importance, and can influence the fracture properties and affect the intended motion.
Identifiants
pubmed: 31479817
pii: S1751-6161(19)30539-9
doi: 10.1016/j.jmbbm.2019.103399
pmc: PMC8686181
mid: NIHMS1669174
pii:
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Langues
eng
Sous-ensembles de citation
IM
Pagination
103399Subventions
Organisme : NIAMS NIH HHS
ID : R01 AR056212
Pays : United States
Organisme : NCATS NIH HHS
ID : TL1 TR000137
Pays : United States
Informations de copyright
Copyright © 2019 Elsevier Ltd. All rights reserved.
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