Biomechanical study and digital modeling of traction resistance in posterior thoracic implants

Spine
Louis Etienne GayetJacques Texereau

Abstract

Posterior implants were used to test the resistance of seven human thoracic spines to traction, and results were compared with those of a digital study. To compare the use of hook and screw fixation methods for posterior thoracic surgery in a study supplemented by a digital analysis using the finite-element method. The maximum break strength of pedicular screws on bone has already been studied several times. Far fewer studies have investigated the stresses that may be applied to pedicular and laminar hooks or compared these hooks with pedicular screws in the thorax. For this study, seven human thoracic spines were used, identifying 49 groups of two vertebrae each. The assemblies used a bolt in the medullary cavity. The central diameter of this bolt could be varied using tubes to suit the individual medullary cavity, spreading the stresses over the entire centrum during traction. The assembly was placed on an Instron machine. Vertical traction was applied up to the maximum break strength, that is, the strength recorded at the top of the traction curve read out directly on the Instron machine. Traction speed in all the tests was 5 mm per minute. Four pedicular screws and two pedicular-laminar clips were used alternately. In these...Continue Reading

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Citations

May 1, 2009·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Michio HongoKai-Nan An
Dec 1, 2004·Journal of Spinal Disorders & Techniques·Onder AydingozHayrettin Kesmezacar
Mar 16, 2005·Neurosurgical Focus·Michael K RosnerStephen L Ondra
Jul 11, 2006·The Spine Journal : Official Journal of the North American Spine Society·Andrew CordistaGlenn Rechtine
Mar 20, 2014·Acta ortopedica brasileira·Sarah Fakher FakhouriAntônio Carlos Shimano
Apr 28, 2020·World Neurosurgery·Feifei ChenXingang Cui

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