Abstract
Long-time working under whole body vibration might accelerate the degeneration of spine and lead to low back pain and other spinal diseases. A poroelastic finite element model of L4-L5 disc segment was generated to investigate the biomechanical response of lumbar spine under different frequency vibration loads. The results show that the change of the deformation, pore pressure, stress and fluid flow under 8 Hz and 11.5 Hz vibration loads appears periodic; however, the change under lower frequency vibration loads (1 Hz and 4 Hz) is relatively gentle. With increasing time, the axial displacement of disc increases, the liquid gradually flows away and the pore pressure and effective stress in nucleus all show an upward trend. The deformation, stress and fluid flow of the L4-L5 disc segment present a periodicity under higher-frequency vibration loads; however, the fluctuation period is larger than the load frequency, which means that the poroelastic characteristic of intervertebral disc presents a strong damping effect. The effective stress and pore pressure of the nucleus show a rising trend under vibration loads. The findings of this study exhibited the poroelastic performance of the spine under different frequency vibration loads.
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Recommended by Associate Editor Seungbum Koo
Li-xin Guo received his Ph.D. at Northeastern University, China. He was a Research Fellow at Nanyang Technological University, Singapore from 2002 to 2004. He was a Research Fellow at The Hong Kong Polytechnic University, Hong Kong, in 2007, 2009, 2012. He has been a Professor at Northeastern University since 2008. He has published more than 130 research papers and 8 patents. His research interests include Biomechanics, Mechanical CAE, Mechanical vibration & control and Vehicle dynamics.
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Guo, LX., Li, R. Influence of vibration frequency variation on poroelastic response of intervertebral disc of lumbar spine. J Mech Sci Technol 33, 973–979 (2019). https://doi.org/10.1007/s12206-019-0154-z
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DOI: https://doi.org/10.1007/s12206-019-0154-z