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首页> 外文会议>ASME international mechanical engineering congress and exposition >ASSESSMENT OF THE DYNAMIC RESPONSE OF A LUMBAR SPINE FUNCTIONAL UNIT UNDER AXIAL COMPRESSIVE HIGH LOADING RATE: OUTCOME ON THE AXIAL DISC BULGE AND ITS RELATION TO THE LOAD MAGNITUDE
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ASSESSMENT OF THE DYNAMIC RESPONSE OF A LUMBAR SPINE FUNCTIONAL UNIT UNDER AXIAL COMPRESSIVE HIGH LOADING RATE: OUTCOME ON THE AXIAL DISC BULGE AND ITS RELATION TO THE LOAD MAGNITUDE

机译：轴向压缩高负荷率下腰椎脊柱功能单元动力响应的评估：轴突凸起的结果及其与负荷大小的关系

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Human lumbar spine tolerance to the compressive impact loading is less when compared to its tolerance to the perpendicular dynamic load. The dynamic response of the functional spinal unit in compressive loading is governed by the viscoelastic behavior of the IVD (Intervertebral disc). The axial bulge of the disc is the result of viscoelastic nature of the nucleus which tends to swell under high loading rate. This characteristic causes the end-plate to bow into the cancellous bone as it is supported by the strong cortical bone on its periphery. The end-plate is one of the important elements in the functional spinal unit if failed results disc material to progress into the vertebral body beneath it. This paper quantifies the axial bulge of the end-plate under dynamic compressive load using Finite Element Method. A simple validated axis symmetry FE model is employed to identify the most vulnerable lumbar spine level using the sensitivity analysis. This is followed by the development of more detailed FE model with viscoelastic modeling of the nucleus and the annulus. The dynamic load is applied on the superior vertebral body which follows triangular loading profile with 50ms rise time. The axial bulge is quantified at the center of the disc as this is the location of maximum deflection and local stress in the end-plate. The ratio of axial bulge and the total FSU deflection is plotted against magnitude of load applied to gain insight regarding the relation between load magnitude and axial bulge.This study will complement the research on end-plate fracture mechanism and its role in causing the burst fracture based on the magnitude of load.
机译：与对垂直动态负荷的耐受性相比，人腰椎对压缩冲击负荷的耐受性较小。功能性脊柱单位在压缩负荷下的动态响应受IVD（椎间盘）的粘弹性行为支配。椎间盘的轴向隆起是核的粘弹性的结果，其在高加载速率下趋于膨胀。该特征导致端板弯曲成松质骨，因为它在其外围由坚固的皮质骨支撑。如果失败会导致椎间盘材料进入其下方的椎体，则终板是功能性脊柱单元中的重要元素之一。本文采用有限元方法对动压载荷作用下端板的轴向凸起进行了量化。使用简单的经过验证的轴对称有限元模型，通过敏感性分析确定最易受伤害的腰椎水平。接下来是开发更详细的有限元模型，并对原子核和环的粘弹性建模。动载荷施加在上椎体上，该椎体遵循三角形载荷曲线，上升时间为50ms。轴向隆起在圆盘中心量化，因为这是端板中最大挠度和局部应力的位置。绘制轴向凸起与FSU总挠度之比与所施加载荷的大小的关系图，以了解载荷大小与轴向凸起之间的关系。本研究将补充有关端板断裂机理及其在引起爆裂断裂中的作用的研究根据负载的大小。

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