A FINITE-ELEMENT MUSCULOSKELETAL MODEL OF THE SHOULDER MECHANISM
A FINITE-ELEMENT MUSCULOSKELETAL MODEL OF THE SHOULDER MECHANISM
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DOI：
10.1016/0021-9290(94)90065-5
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发表时间：
1994-05-01
影响因子：
2.4
通讯作者：
VANDERHELM, FCT
中科院分区：
文献类型：
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作者：
VANDERHELM, FCT
本研究中描述的有限元方法提供了一种模拟多体机构动力学的简单方法。它用于开发肩部机构的肌肉骨骼模型。每个相关的形态结构都由适当的元素表示。对于肩部机构，开发了两个特殊用途的元素：代表肩胸滑动平面的 SURFACE 元素和代表包裹在骨骼轮廓周围的肌肉的 CURVED-TRUSS 元素。该模型包含四块骨头、三个关节、三个囊外韧带、肩胸滑动面和20块肌肉和肌肉部位。在模型中，输入变量是肩带和肱骨的位置以及肱骨上的外部负载。输出变量是受优化程序影响的肌肉力，其中盂肱关节的机械稳定性是约束之一。比较了四种不同的优化标准。对于12块肌肉，使用表面肌电图来验证模型。由于最佳肌肉长度和力-长度关系未知，并且由于最大肌电图振幅取决于长度，因此只能在定性意义上进行验证。尽管如此，得出的结论是，肩部机制的详细模型已经开发出来，可以很好地洞察形态结构的功能。
The finite element method described in this study provides an easy method to simulate the kinetics of multibody mechanisms. It is used in order to develop a musculoskeletal model of the shoulder mechanism. Each relevant morphological structure has been represented by an appropriate element. For the shoulder mechanism two special-purpose elements have been developed: a SURFACE element representing the scapulothoracic gliding plane and a CURVED-TRUSS element to represent muscles which are wrapped around bony contours. The model contains four bones, three joints, three extracapsular ligaments, the scapulothoracic gliding plane and 20 muscles and muscle parts. In the model, input variables are the positions of the shoulder girdle and humerus and the external load on the humerus. Output variables are muscle forces subject to an optimization procedure in which the mechanical stability of the glenohumeral joint is one of the constraints. Four different optimization criteria are compared. For 12 muscles, surface EMG is used to verify the model. Since the optimum muscle length and force-length relationship are unknown, and since maximal EMG amplitude is length dependent, verification is only possible in a qualitative sense. Nevertheless, it is concluded that a detailed model of the shoulder mechanism has been developed which provides good insight into the function of morphological structures.