Muscular resistance to varus and valgus loads at the elbow
Muscular resistance to varus and valgus loads at the elbow
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DOI：
10.1115/1.2834755
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发表时间：
1998-10-01
影响因子：
1.7
通讯作者：
Solbeck, JA
中科院分区：
文献类型：
--
作者：
Buchanan, TS;Delp, SL;Solbeck, JA
尽管被动结构对肘部稳定性的贡献已被充分记录，但肘部内翻和外翻负荷的主动肌肉阻力的作用仍不清楚。我们假设肌肉：（1）可以在肘部产生大量的内翻和外翻力矩，（2）响应肘部的持续内翻和外翻负荷而被激活。为了检验第一个假设，我们建立了一个详细的肌肉骨骼模型来估计肘部周围肌肉的内翻和外翻力矩生成能力。为了检验第二个假设，我们测量了 4 名受试者在执行一系列等距任务期间的 11 块肌肉的肌电图，这些任务包括肘部的屈曲、伸展、内翻和外翻时刻。肌电图记录被用作肘部模型的输入，以估计单个肌肉对屈曲-伸展和内翻-外翻力矩的贡献。模型分析表明，几乎所有穿过肘部的肌肉都能够产生内翻或外翻力矩；肌肉产生内翻力矩（34 Nm）和外翻力矩（35 Nm）的能力大约是最大屈曲力矩（70 Nm）的一半。对测量的肌电图的分析表明，肘肌是外翻力矩的最大贡献者，旋前圆肌是内翻力矩的最大贡献者。尽管我们的结果表明肌肉因静态内翻和外翻而被激活，但它们的激活是适度的，不足以平衡所施加的负荷。
Although the contributions of passive structures to stability of the elbow have been well documented, the role of active muscular resistance of varus and valgus loads at the elbow remains unclear. We hypothesized that muscles: (1) can produce substantial varus and valgus moments about the elbow, and (2) are activated in response to sustained varus and valgus loading of the elbow. To test the first hypothesis, we der eloped a detailed musculoskeletal model to estimate the varus and valgus moment-generating capacity of the muscles about the elbow. To test the second hypothesis, we measured EMGs from 11 muscles in four subjects during a series of isometric tasks that included flexion, extension, varus, and valgus moments about the elbow. The EMG recordings were used as inputs to the elbow model to estimate the contributions of individual muscles to flexion-extension and varus-valgus moments. Analysis of the model revealed that nearly all of the muscles that cross the elbow are capable of producing varus or valgus moments; the capacity of the muscles to produce varus moment (34 Nm) and valgus moment (35 Nm) is roughly half of the maximum flexion moment (70 Nn). Analysis of the measured EMGs showed that the anconeus was the most significant contributor to valgus moments and the pronator teres,vas the largest contributor to varus moments. Although our results show that muscles were activated in response to static varus and valgus lends, their activations were modest and were not sufficient to balance the applied load.