Rectus femoris and vastus intermedius fiber excursions predicted by three-dimensional muscle models
Rectus femoris and vastus intermedius fiber excursions predicted by three-dimensional muscle models
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DOI：
10.1016/j.jbiomech.2005.04.012
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Delp, Scott L.
中科院分区：
文献类型：
--
作者：
Blemker, Silvia S.;Delp, Scott L.
肌肉骨骼系统的计算机模型经常用集总参数模型来表示肌肉的力-长度行为。集总参数模型使用简单的几何形状来表征肌肉纤维和肌腱的排列；这可能不准确地反映纤维长度的变化和由此产生的力-长度行为，特别是对于结构复杂的肌肉。本研究的目的是确定股直肌和股中间肌结构的复杂特征对纤维长度变化的影响程度（“纤维偏移”）。我们基于磁共振（MR）图像建立了股直肌和股中间肌的三维有限元模型，并将有限元模型预测的纤维偏移与这些肌肉的集中参数模型预测的纤维偏移进行了比较。有限元模型预测股直肌纤维漂移（膝关节屈曲超过100度范围）在55%到70%的肌肉-肌腱单元偏移范围内变化，股中间肌纤维漂移在55%到98%的肌肉-肌腱单元偏移范围内变化。相比之下，股直肌的集总参数模型预测的纤维偏移占肌肉肌腱单元偏移的86%，股中间肌纤维偏移占肌肉肌腱单元偏移的97%。这些结果表明，在这些肌肉的集总参数模型中，许多纤维的纤维漂移被高估了。这些肌肉结构的新表示可以提高计算机模拟运动的准确性，并为肌肉设计提供见解。(c) 2005 Elsevier Ltd版权所有。
Computer models of the musculoskeletal system frequently represent the force-length behavior of muscle with a lumped-parameter model. Lumped-parameter models use simple geometric shapes to characterize the arrangement of muscle fibers and tendon; this may inaccurately represent changes in fiber length and the resulting force-length behavior, especially for muscles with complex architecture. The purpose of this study was to determine the extent to which the complex features of the rectus femoris and vastus intermedius architectures affect the fiber changes in length ("fiber excursions"). We created three-dimensional finite-element models of the rectus femoris and vastus intermedius muscles based on magnetic resonance (MR) images, and compared the fiber excursions predicted by the finite-element models with fiber excursions predicted by lumped-parameter models of these muscles. The finite-element models predicted rectus femoris fiber excursions (over a 100 degrees range of knee flexion) that varied from 55% to 70% of the excursion of the muscle-tendon unit and vastus intermedius fiber excursions that varied from 55% to 98% of the excursion muscle-tendon unit. In contrast, the lumped-parameter model of the rectus femoris predicted fiber excursions that were 86% of the excursion of the muscle-tendon unit and vastus intermedius fiber excursions that were 97% of the excursion of the muscle-tendon unit. These results suggest that fiber excursions of many fibers are overestimated in lumped-parameter models of these muscles. These new representations of muscle architecture can improve the accuracy of computer simulations of movement and provide insight into muscle design. (c) 2005 Elsevier Ltd. All rights reserved.