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Development of a modeling technique for the investigation of muscle activity and its effect on bone stresses in the human leg during an isometric exercise

机译:等距运动期间用于研究肌肉活动及其对人腿骨应力影响的建模技术的开发

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The study of the stress distributions within a bone can provide significant insight into its function and the adaptations that may take place under a set of loading conditions. Because the individual muscle forces acting on a bone are directly related to its behavior, bone stress analyses depend on the accurate estimation of muscle forces. The development of an integrated modeling method to determine such muscle forces and to apply them to the stress analysis of a system of bones is described. Firstly, a numerical optimization method was used in the development and validation of a model to predict the individual muscle forces generated in a leg that produce a known net resultant load. Next, this model was integrated into a finite element simulation of a system of leg bones so that the calculated isometric muscle forces could automatically be applied and the bone stresses calculated. The geometric, material, and joint contact conditions needed to appropriately depict the system's behavior were established. Finally, the developed modeling technique was implemented in parametric studies to reveal significant changes in muscle activity and bone stress magnitudes and distributions due to variations in the direction of the net resultant load. The smallest muscle forces occurred in loading directions most typical of daily activities and resulted in bone stresses that were an order of magnitude smaller than those resulting from more uncommon loading directions. The developed modeling technique was shown to provide a controlled means of investigating the relationships between muscle forces and bone stresses.
机译:对骨骼内应力分布的研究可以提供对骨骼功能以及在一组载荷条件下可能发生的适应的重要了解。由于作用在骨骼上的各个肌肉力量与骨骼的行为直接相关,因此骨骼应力分析取决于肌肉力量的准确估算。描述了确定这种肌肉力并将其应用于骨骼系统的应力分析的集成建模方法的发展。首先,在模型的开发和验证中使用了数值优化方法来预测腿部产生的单个肌肉力,从而产生已知的净合力。接下来,将此模型集成到腿骨系统的有限元模拟中,以便可以自动应用计算出的等轴测肌肉力并计算出骨骼应力。建立了适当描述系统行为所需的几何,材料和关节接触条件。最后,在参数研究中实施了开发的建模技术,以揭示由于净合力的方向变化而导致的肌肉活动以及骨骼应力大小和分布的显着变化。最小的肌肉力发生在日常活动中最典型的加载方向上,导致的骨骼应力比不常见的加载方向所导致的骨骼应力小一个数量级。所开发的建模技术显示出可提供一种调查肌肉力和骨应力之间关系的受控方法。

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