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Parametric Finite Element Modeling of a Lumbar Motion Segment

Ramezanzadeh Koldeh, Masoud | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41860 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Assempour, Ahmad; Kasra, Mehran
  7. Abstract:
  8. Spinal Column is one of the most important parts of musculoskeletal system. Injuries in this region are so rampant and causing vast expense. Risk factors related to spine injuries included personal related ones such as age, sex, muscles’ strength and career related ones such as body positions at work place and loads.
    Since in vivo measurements have many restrictions, developing biomechanical models that simulate the response of a person to given loads and conditions have important role in preventing injuries and improving working conditions.
    In the present study, the parametric model of lumbar motion segment is presented, for this purpose, 12 different CT scan pictures were analyzed by using MIMICS, then optimum curves were fitted through the pre/determined points, those curves were imported to ANSYS software, parametric model was created by using APDL in ANSYS environment. In our model most parameters were concentrated on facet joint, some of these parameters are: facet joint angle in sagittal and transverse plane, cartilage thickness in facet joint, Radius of spinal hole, transverse process and spinous process.
    For accurate modeling of facet joint, space between two facet joint surfaces was filled by a fluid that had properties like synovial joints; in model, the fluid has the ability to slide on facet joint surface. For validation of our model, 7.5 and 10 (N.m) torsion moments along with 400 (N) compressive preload were applied to model, and load of facet joint was calculated and compared with other experimental and FEM models
  9. Keywords:
  10. Finite Element Model ; Image Processing ; Anotomical Variation ; Facet Joints

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