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期刊名称: Journal of Biomechanics
Volume:43    Issue:10        Page:1849-1856

Response analysis of the lumbar spine during regular daily activities—A finite element analysis期刊论文

作者: Schmidt Hendrik Shirazi-Adl Aboulfazl Galbusera Fabio Wilke Hans-Joachim

页码: 1849-1856
被引频次: 61
出版者: Elsevier Ltd,ELSEVIER SCI LTD,Elsevier B.V,Elsevier Limited
期刊名称: Journal of Biomechanics
ISSN: 0021-9290
卷期: Volume:43    Issue:10
语言: English
摘要: Abstract A non-linear poroelastic finite element model of the lumbar spine was developed to investigate spinal response during daily dynamic physiological activities. Swelling was simulated by imposing a boundary pore pressure of 0.25 MPa at all external surfaces. Partial saturation of the disc was introduced to circumvent the negative pressures otherwise computed upon unloading. The loading conditions represented a pre-conditioning full day followed by another day of loading: 8 h rest under a constant compressive load of 350 N, followed by 16 h loading phase under constant or cyclic compressive load varying in between 1000 and 1600 N. In addition, the effect of one or two short resting periods in the latter loading phase was studied. The model yielded fairly good agreement with in-vivo and in-vitro measurements. Taking the partial saturation of the disc into account, no negative pore pressures were generated during unloading and recovery phase. Recovery phase was faster than the loading period with equilibrium reached in only ∼3 h. With time and during the day, the axial displacement, fluid loss, axial stress and disc radial strain increased whereas the pore pressure and disc collagen fiber strains decreased. The fluid pressurization and collagen fiber stiffening were noticeable early in the morning, which gave way to greater compression stresses and radial strains in the annulus bulk as time went by. The rest periods dampened foregoing differences between the early morning and late in the afternoon periods. The forgoing diurnal variations have profound effects on lumbar spine biomechanics and risk of injury.
相关主题: Physical Medicine and Rehabilitation, Poroelastic, Sorption, Daily activity, Creep, Intervertebral disc, Saturation, Finite element analysis, Recovery, ANULUS FIBROSUS, ENGINEERING, BIOMEDICAL, INTERVERTEBRAL DISC TISSUE, MODEL, COMPRESSION, END-PLATE, IN-VITRO, CALIBRATION METHOD, MECHANICS, BIOPHYSICS, MOTION SEGMENT, WATER-CONTENT, Activities of Daily Living, Biomechanical Phenomena, Computer Simulation, Stress, Mechanical, Finite Element Analysis, Pressure, Lumbar Vertebrae - physiology, Finite element method, Collagen, Analysis, Fibers, Studies, Biomechanics, Load, Index Medicus,






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