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Article: Biomechanics of the tether breakage: tensile behaviour of a single-unit vertebral body tethering construct

TitleBiomechanics of the tether breakage: tensile behaviour of a single-unit vertebral body tethering construct
Authors
KeywordsAdolescent idiopathic scoliosis
Tensile testing
Tether breakage
Vertebral body tethering
Issue Date11-Jul-2023
PublisherSpringer
Citation
Spine Deformity, 2023, v. 11, n. 4, p. 825-831 How to Cite?
Abstract

PurposeTether breakage was reported as the most common complication of vertebral body tethering. However, as the literature suggests the physiological loads do not have the potential to cause the failure of the tether. Currently, the biomechanical reason behind the tether breakage is unknown. The current study aims to elucidate the effects of the tension forces on the failure mechanisms of the VBT and provide mechanical justification for how it can be identified radiographically.MethodsTensile tests (20%/min strain rate) were performed on single-unit VBT samples. Failure modes and mechanical characteristics were reported.ResultsThe failure took place prematurely due to the slippage of the tether at the screw-tether junction where the tether is damaged significantly by the locking cap. Slippage was initiated at 10-13% tensile strain level where the tensile stress and tension force were 50.4 +/- 1.5 MPa and 582.2 +/- 30.8 N, respectively.ConclusionThe failure occurs because of high-stress concentrations generated within the locking region which damages the tether surface and leads to the slippage of the tether. We observed that the loads leading to failure are within the physiological limits and may indicate the high likelihood of the tether breakage. The failure mode observed in our study is shown to be the dominant failure mode, and a design improvement on the gripping mechanism is suggested to avoid failure at the screw-tether junction. We observed that the tether elongates 10-13% prior to the breakage, which can be employed as a diagnostic criterion to screen for tether breakages radiographically.


Persistent Identifierhttp://hdl.handle.net/10722/331842
ISSN
2023 Impact Factor: 1.6
2023 SCImago Journal Rankings: 0.798
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorGuldeniz, O-
dc.contributor.authorYip, CCH-
dc.contributor.authorNafo, W-
dc.contributor.authorCheung, KMC-
dc.date.accessioned2023-09-21T06:59:23Z-
dc.date.available2023-09-21T06:59:23Z-
dc.date.issued2023-07-11-
dc.identifier.citationSpine Deformity, 2023, v. 11, n. 4, p. 825-831-
dc.identifier.issn2212-134X-
dc.identifier.urihttp://hdl.handle.net/10722/331842-
dc.description.abstract<p>PurposeTether breakage was reported as the most common complication of vertebral body tethering. However, as the literature suggests the physiological loads do not have the potential to cause the failure of the tether. Currently, the biomechanical reason behind the tether breakage is unknown. The current study aims to elucidate the effects of the tension forces on the failure mechanisms of the VBT and provide mechanical justification for how it can be identified radiographically.MethodsTensile tests (20%/min strain rate) were performed on single-unit VBT samples. Failure modes and mechanical characteristics were reported.ResultsThe failure took place prematurely due to the slippage of the tether at the screw-tether junction where the tether is damaged significantly by the locking cap. Slippage was initiated at 10-13% tensile strain level where the tensile stress and tension force were 50.4 +/- 1.5 MPa and 582.2 +/- 30.8 N, respectively.ConclusionThe failure occurs because of high-stress concentrations generated within the locking region which damages the tether surface and leads to the slippage of the tether. We observed that the loads leading to failure are within the physiological limits and may indicate the high likelihood of the tether breakage. The failure mode observed in our study is shown to be the dominant failure mode, and a design improvement on the gripping mechanism is suggested to avoid failure at the screw-tether junction. We observed that the tether elongates 10-13% prior to the breakage, which can be employed as a diagnostic criterion to screen for tether breakages radiographically.<br></p>-
dc.languageeng-
dc.publisherSpringer-
dc.relation.ispartofSpine Deformity-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectAdolescent idiopathic scoliosis-
dc.subjectTensile testing-
dc.subjectTether breakage-
dc.subjectVertebral body tethering-
dc.titleBiomechanics of the tether breakage: tensile behaviour of a single-unit vertebral body tethering construct-
dc.typeArticle-
dc.identifier.doi10.1007/s43390-023-00657-2-
dc.identifier.scopuseid_2-s2.0-85147775140-
dc.identifier.volume11-
dc.identifier.issue4-
dc.identifier.spage825-
dc.identifier.epage831-
dc.identifier.eissn2212-1358-
dc.identifier.isiWOS:000932675700001-
dc.identifier.issnl2212-134X-

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