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Effect of Lumbar Spine Lordosis on Intervertebral Joint Load Sharing Using Musculoskeletal and Finite Element Modeling

Havashinezhadian, Sara | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51830 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arjmand, Navid
  7. Abstract:
  8. There is a large, at times contradictory body of investigations relating low back pain and spinal curvature in sagittal plane. The previous studies have not been subject-specified, and they have not considered the active tissues in the models. The mechanical load has a significant impact on the prevalence of low back pain and the geometry of lumbar spine in the sagittal plane is one of the most important characteristics in determining the load sharing of the spine. Thus, it is essential to know how the geometry load affects the load sharing of the lumbar spine. As a matter of fact, the purpose of this project is to know how the geometry of the lumbar spine affects the load sharing. Thus, geometries of two persons (hyper-lordosis and normal-lordosis) were imported in ABAQUS and subject specified muscle loads were derived from the musculoskeletal models. Then, the musculoskeletal output data were applied to the finite element models, and the output data were obtained using the finite element method. After all, the models were simplified, and the muscle loads were applied to the finite element models. Thereby, it became possible to examine the effect of geometry on the load sharing of facet joints, discs, and ligaments. The present model can determine the impact of the lumbar lordosis geometry on the load sharing of the components of the lumbar spine, and we could specify which of the geometries carry the highest load and whether there is a risk of low back pain or not. The normal-lordosis model showed lower disc compression and shear comparing to the Hyper-lordosis model. Besides, the spinal curvature strongly influenced the muscle loads in each model, and it also affected the magnitude of the load in the spinal components
  9. Keywords:
  10. Lumbar Spine Lordosis ; Musculoskeletal Modeling ; Finite Element Model ; Intradiscal Pressure ; Compressive Force ; Shear Force

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