A Study of the Vibration Characteristics of Human Whole Lumbar Spine Based on 3D Finite Element Model
Exposure to vibration has been considered a major cause of the lumbar degenerative disease and low back pain.The aim of this study was to explore the effects of vibration load on lumbar spine biomechanics.Based on CT scan data of human lumbar spine from L1 segment to pelvis(L1-pelvis),a 3-D geometric model of the L1-pelvis was reconstructed.Then,mesh generation and material properties assignment were performed to the geometric model to develop a 3-D finite element model of the L1-pelvis,which was validated according to several available experimental data.Based on this finite-element model,the biomechanical responses of each lumbar spinal segment under an axial sinusoidal vibration load of 40 N with a frequency of 5 Hz were computed through transient dynamic analysis and compared with the corresponding results under-40 N and+40 N axial static loads.The response parameters included axial displacement of vertebral center,disc bulge,and von-Mises stress in annulus ground substance.The results showed that compared with the static loads,the amplitudes of vertebral axial displacement,disc bulge,and annulus stress for each lumbar spinal segment under the vibration load increased by 0.550～1.020 mm,0.124～0.251 mm,and 0.043～0.099 MPa,respectively,and the maximum increasing effect reached to 195.0％,175.7％,and 151.4％,respectively.It implies that the lumbar spine might face a higher likelihood of injury under the vibration load.
human lumbar spinebiomechanicsfinite-element modelvibration load
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万方数据
