The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading

Simplified loading conditions such as pure moments are frequently used to compare different instrumentation techniques to treat spine disorders. The purpose of this study was to determine if the use of realistic loading conditions such as muscle forces can alter the stresses in the implants with res...

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Autores principales:	Matteo Panico, Tito Bassani, Tomaso Maria Tobia Villa, Fabio Galbusera
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	muscles forces pure moments spinal fixation lumbar fixation realistic loading conditions simplified loading conditions Biotechnology TP248.13-248.65
Acceso en línea:	https://doaj.org/article/d9828b85e77f40cfa5da1c7b0089adbc
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spelling	oai:doaj.org-article:d9828b85e77f40cfa5da1c7b0089adbc2021-11-22T06:39:11ZThe Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading2296-418510.3389/fbioe.2021.745703https://doaj.org/article/d9828b85e77f40cfa5da1c7b0089adbc2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fbioe.2021.745703/fullhttps://doaj.org/toc/2296-4185Simplified loading conditions such as pure moments are frequently used to compare different instrumentation techniques to treat spine disorders. The purpose of this study was to determine if the use of realistic loading conditions such as muscle forces can alter the stresses in the implants with respect to pure moment loading. A musculoskeletal model and a finite element model sharing the same anatomy were built and validated against in vitro data, and coupled in order to drive the finite element model with muscle forces calculated by the musculoskeletal one for a prescribed motion. Intact conditions as well as a L1-L5 posterior fixation with pedicle screws and rods were simulated in flexion-extension and lateral bending. The hardware stresses calculated with the finite element model with instrumentation under simplified and realistic loading conditions were compared. The ROM under simplified loading conditions showed good agreement with in vitro data. As expected, the ROMs between the two types of loading conditions showed relatively small differences. Realistic loading conditions increased the stresses in the pedicle screws and in the posterior rods with respect to simplified loading conditions; an increase of hardware stresses up to 40 MPa in extension for the posterior rods and 57 MPa in flexion for the pedicle screws were observed with respect to simplified loading conditions. This conclusion can be critical for the literature since it means that previous models which used pure moments may have underestimated the stresses in the implants in flexion-extension and in lateral bending.Matteo PanicoMatteo PanicoTito BassaniTomaso Maria Tobia VillaTomaso Maria Tobia VillaFabio GalbuseraFrontiers Media S.A.articlemuscles forcespure momentsspinal fixationlumbar fixationrealistic loading conditionssimplified loading conditionsBiotechnologyTP248.13-248.65ENFrontiers in Bioengineering and Biotechnology, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	muscles forces pure moments spinal fixation lumbar fixation realistic loading conditions simplified loading conditions Biotechnology TP248.13-248.65
spellingShingle	muscles forces pure moments spinal fixation lumbar fixation realistic loading conditions simplified loading conditions Biotechnology TP248.13-248.65 Matteo Panico Matteo Panico Tito Bassani Tomaso Maria Tobia Villa Tomaso Maria Tobia Villa Fabio Galbusera The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading
description	Simplified loading conditions such as pure moments are frequently used to compare different instrumentation techniques to treat spine disorders. The purpose of this study was to determine if the use of realistic loading conditions such as muscle forces can alter the stresses in the implants with respect to pure moment loading. A musculoskeletal model and a finite element model sharing the same anatomy were built and validated against in vitro data, and coupled in order to drive the finite element model with muscle forces calculated by the musculoskeletal one for a prescribed motion. Intact conditions as well as a L1-L5 posterior fixation with pedicle screws and rods were simulated in flexion-extension and lateral bending. The hardware stresses calculated with the finite element model with instrumentation under simplified and realistic loading conditions were compared. The ROM under simplified loading conditions showed good agreement with in vitro data. As expected, the ROMs between the two types of loading conditions showed relatively small differences. Realistic loading conditions increased the stresses in the pedicle screws and in the posterior rods with respect to simplified loading conditions; an increase of hardware stresses up to 40 MPa in extension for the posterior rods and 57 MPa in flexion for the pedicle screws were observed with respect to simplified loading conditions. This conclusion can be critical for the literature since it means that previous models which used pure moments may have underestimated the stresses in the implants in flexion-extension and in lateral bending.
format	article
author	Matteo Panico Matteo Panico Tito Bassani Tomaso Maria Tobia Villa Tomaso Maria Tobia Villa Fabio Galbusera
author_facet	Matteo Panico Matteo Panico Tito Bassani Tomaso Maria Tobia Villa Tomaso Maria Tobia Villa Fabio Galbusera
author_sort	Matteo Panico
title	The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading
title_short	The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading
title_full	The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading
title_fullStr	The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading
title_full_unstemmed	The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading
title_sort	simulation of muscles forces increases the stresses in lumbar fixation implants with respect to pure moment loading
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/d9828b85e77f40cfa5da1c7b0089adbc
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The Simulation of Muscles Forces Increases the Stresses in Lumbar Fixation Implants with Respect to Pure Moment Loading

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