VARIATION OF MUSCLE MOMENT ARMS WITH ELBOW AND FOREARM POSITION
VARIATION OF MUSCLE MOMENT ARMS WITH ELBOW AND FOREARM POSITION
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DOI：
10.1016/0021-9290(94)00114-j
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发表时间：
1995-05-01
影响因子：
2.4
通讯作者：
BUCHANAN, TS
中科院分区：
文献类型：
--
作者：
MURRAY, WM;DELP, SL;BUCHANAN, TS
我们假设跨手肘的力臂随前臂和肘部位置的变化而变化，这些变化可以用三维计算机模型来表示。肱桡肌、肱二头肌、肱肌、旋前圆肌和肱三头肌的伸展/伸展和旋前/旋后力矩臂通过测量两个解剖标本的肌腱位移和关节角度计算，并使用手肘关节的计算机模型进行估计。解剖学测量结果显示，在95度的运动范围内，屈曲/伸展力臂变化至少30%。计算机模型能很好地反映屈/伸力臂大小随肘关节屈曲角度的变化。解剖学研究和计算机模型表明，肱二头肌屈曲力矩臂峰值在更广泛的肘部位置，并有一个更大的峰值时，前臂旋后。此外，峰值二头肌旋后力臂随着手肘伸展而减小。这些结果强调需要考虑肘关节屈曲和前臂位置的肌肉力矩臂的变化。
We hypothesized that the moment arms of muscles crossing the elbow vary substantially with forearm and elbow position and that these variations could be represented using a three-dimensional computer model. Flexion/extension and pronation/supination moment arms of the brachioradialis, biceps, brachialis, pronator teres, and triceps were calculated from measurements of tendon displacement and joint angle in two anatomic specimens and were estimated using a computer model of the elbow joint. The anatomical measurements revealed that the flexion/extension moment arms varied by at least 30% over a 95 degrees range of motion. The changes in flexion/extension moment arm magnitudes with elbow flexion angle were represented well by the computer model. The anatomical studies and the computer model demonstrate that the biceps flexion moment arm peaks in a more extended elbow position and has a larger peak when the forearm is supinated. Also, the peak biceps supination moment arm decreases as the elbow is extended. These results emphasize the need to account for the variation of muscle moment arms with elbow flexion and forearm position.