The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis

Many important medical associations define obesity as a disease. Being overweight or obese is a serious disorder that affects human spine. Obesity is a contributing factor to back pain due to changing for the mechanical properties as a result to the over loading. Hence, being overweight or obese can...

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Main Author:	Mohammad, Raed Ali
Format:	Thesis
Language:	English English
Published:	2016
Subjects:	Q Science (General) QP Physiology
Online Access:	http://eprints.utem.edu.my/id/eprint/18642/1/The%20Biomechanical%20Effect%20Of%20Human%20Weight%20On%20Spinal%20Facet%20Joints%20Using%20Finite%20Element%20Analysis%2024%20Pages.pdf http://eprints.utem.edu.my/id/eprint/18642/2/The%20Biomechanical%20Effect%20Of%20Human%20Weight%20On%20Spinal%20Facet%20Joints%20Using%20Finite%20Element%20Analysis.pdf
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spelling	my-utem-ep.186422022-03-17T16:01:58Z The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis 2016 Mohammad, Raed Ali Q Science (General) QP Physiology Many important medical associations define obesity as a disease. Being overweight or obese is a serious disorder that affects human spine. Obesity is a contributing factor to back pain due to changing for the mechanical properties as a result to the over loading. Hence, being overweight or obese can significantly contribute to symptoms associated with osteoarthritis (OA), facet joint arthritis, degenerative disc disease (DDD), spinal stenosis, and spondylolisthesis. However, the facet joint behavior regarding the body weight effects under separate loadings or the responses to the compressive loads in the discs need to be identified. Moreover, using cadaveric specimens in biomechanics testing of the lumbar spine restricted with a difficulty in acquiring the disc pressure, bone strain and facet joint contact pressure. While, simulation model looks into all of these disadvantages. Thus, the goal of the current study was to develop a method to simulate the biomechanics of the lumbar spine, and to delve into the effect of obesity on the intervertebral discs and facet joint in addition to provide the system analysis of the spine between multi body weights. The finite element analysis results will highlight significant differences if the model adopted is performed under different material properties, geometries, loading modes or other conditions. A process is currently in use to transform a CT scan of a lumbar spine into a simulation model. The process includes changing the CT scan to a geometry file and creating a mesh of the bone and soft tissue, and assigning material properties to each bone element based on the bone density. Lumbar spine models was developed and verified with previous studies. The finite element model was subjected to follower compression load of 500 N, 800 N and 1200 N to represent the load case of normal, overweight and obese with a combination of pure moments of 7.5 Nm in flexion and extension. The results highlight the fact that in all loadings case of (normal, overweight and obese people), there are high distributions of stress in both L4 and L5 and so on the intervertebral discs. Increasing the human weight was in turn increasing the nucleus pulposus pressures and annulus fibrosus stresses. Intradiscal pressures in the nucleus pulposus were increased more noticeably with flexion than with extension. With regard to the facet joint forces, flexion resulted in a larger facet force in the superior facet joints· than that in the inferior facet joints at the same level and in extension was 21% more than flexion motion, and both of them were in increment at over and obese person weight. Moreover, it also appeared that the influence of the magnitude of normal body weight loads on the facet force was less important than that due to overweight and obese weight. This model also can serve to simulate the implants performance including the total disc replacement and fusion techniques. UTeM 2016 Thesis http://eprints.utem.edu.my/id/eprint/18642/ http://eprints.utem.edu.my/id/eprint/18642/1/The%20Biomechanical%20Effect%20Of%20Human%20Weight%20On%20Spinal%20Facet%20Joints%20Using%20Finite%20Element%20Analysis%2024%20Pages.pdf text en public http://eprints.utem.edu.my/id/eprint/18642/2/The%20Biomechanical%20Effect%20Of%20Human%20Weight%20On%20Spinal%20Facet%20Joints%20Using%20Finite%20Element%20Analysis.pdf text en validuser http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000100802 mphil masters Universiti Teknikal Malaysia Melaka Faculty of Mechanical Engineering
institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
topic	Q Science (General) QP Physiology
spellingShingle	Q Science (General) QP Physiology Mohammad, Raed Ali The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis
description	Many important medical associations define obesity as a disease. Being overweight or obese is a serious disorder that affects human spine. Obesity is a contributing factor to back pain due to changing for the mechanical properties as a result to the over loading. Hence, being overweight or obese can significantly contribute to symptoms associated with osteoarthritis (OA), facet joint arthritis, degenerative disc disease (DDD), spinal stenosis, and spondylolisthesis. However, the facet joint behavior regarding the body weight effects under separate loadings or the responses to the compressive loads in the discs need to be identified. Moreover, using cadaveric specimens in biomechanics testing of the lumbar spine restricted with a difficulty in acquiring the disc pressure, bone strain and facet joint contact pressure. While, simulation model looks into all of these disadvantages. Thus, the goal of the current study was to develop a method to simulate the biomechanics of the lumbar spine, and to delve into the effect of obesity on the intervertebral discs and facet joint in addition to provide the system analysis of the spine between multi body weights. The finite element analysis results will highlight significant differences if the model adopted is performed under different material properties, geometries, loading modes or other conditions. A process is currently in use to transform a CT scan of a lumbar spine into a simulation model. The process includes changing the CT scan to a geometry file and creating a mesh of the bone and soft tissue, and assigning material properties to each bone element based on the bone density. Lumbar spine models was developed and verified with previous studies. The finite element model was subjected to follower compression load of 500 N, 800 N and 1200 N to represent the load case of normal, overweight and obese with a combination of pure moments of 7.5 Nm in flexion and extension. The results highlight the fact that in all loadings case of (normal, overweight and obese people), there are high distributions of stress in both L4 and L5 and so on the intervertebral discs. Increasing the human weight was in turn increasing the nucleus pulposus pressures and annulus fibrosus stresses. Intradiscal pressures in the nucleus pulposus were increased more noticeably with flexion than with extension. With regard to the facet joint forces, flexion resulted in a larger facet force in the superior facet joints· than that in the inferior facet joints at the same level and in extension was 21% more than flexion motion, and both of them were in increment at over and obese person weight. Moreover, it also appeared that the influence of the magnitude of normal body weight loads on the facet force was less important than that due to overweight and obese weight. This model also can serve to simulate the implants performance including the total disc replacement and fusion techniques.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Mohammad, Raed Ali
author_facet	Mohammad, Raed Ali
author_sort	Mohammad, Raed Ali
title	The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis
title_short	The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis
title_full	The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis
title_fullStr	The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis
title_full_unstemmed	The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis
title_sort	biomechanical effect of human weight on spinal facet joints using finite element analysis
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty of Mechanical Engineering
publishDate	2016
url	http://eprints.utem.edu.my/id/eprint/18642/1/The%20Biomechanical%20Effect%20Of%20Human%20Weight%20On%20Spinal%20Facet%20Joints%20Using%20Finite%20Element%20Analysis%2024%20Pages.pdf http://eprints.utem.edu.my/id/eprint/18642/2/The%20Biomechanical%20Effect%20Of%20Human%20Weight%20On%20Spinal%20Facet%20Joints%20Using%20Finite%20Element%20Analysis.pdf
_version_	1747833946748485632

The Biomechanical Effect Of Human Weight On Spinal Facet Joints Using Finite Element Analysis

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