Flexion strength of the toes in the normal foot. An evaluation using magnetic resonance imaging.
Flexion strength of the toes in the normal foot. An evaluation using magnetic resonance imaging.
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DOI：
10.1016/j.foot.2013.07.001
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发表时间：
2013-12-01
期刊：
影响因子：
--
通讯作者：
Briggs, P J
中科院分区：
文献类型：
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作者：
Green, S M;Briggs, P J
脚趾屈曲可能是由肌肉收缩引起的主动屈曲，也可能是由足底腱膜的反向绞车功能引起的被动屈曲。这项研究的目的是估计足部肌肉和长指屈肌可能产生的屈曲力矩，并将这些计算结果与公布的数据进行比较。用磁共振图像测量足部肌肉和指长屈肌的最大横截面积，以及跖头的曲率半径。利用已知的生理数据，计算了在跖趾关节(MTP)处肌肉可能产生的最大屈曲力矩。该方法高估了跖趾关节的肌肉力量和屈曲力矩。计算出第1个MTP关节的最大屈曲力矩为4.27~6.84 Nm，第2、3、4个MTP关节的最大屈曲力矩为3.06~4.91 Nm，第5个MTP关节的最大屈曲力矩为0.47~0.75 Nm。肌肉可能在MTP关节处产生的屈曲力不能解释正常行走中所看到的屈曲力。考虑到正常行走不使用最大力量，我们得出结论，足底腱膜的反向绞车机制在脚趾的正常功能中肯定是重要的。
Flexion of the toes may be active from muscle contraction or passive from the reversed windlass function of the plantar aponeurosis. The aim of this study was to estimate the flexion moments the muscles of the foot and long digital flexors may be capable of generating and compare these calculations with published data. Magnetic resonance images were used to measure the maximal cross-sectional area of the foot muscles and long digital flexors, along with the radius of curvature of the metatarsal heads. Using known physiological data the maximal flexion moments the muscles may be able to generate at the metatarsophalangeal (MTP) joints were calculated. The methodology overestimates muscle strength and flexion moments at the metatarsophalangeal joints. The calculated maximal flexion moment at the 1st MTP joint is 4.27-6.84 Nm, for the 2nd, 3rd and 4th MTP joints 3.06-4.91 Nm, and the 5th MTP joint 0.47-0.75 Nm. The flexion moments the muscles may generate at the MTP joints do not account for the flexion forces seen in normal walking. Given that maximal strength is not used in normal walking, we conclude that the reversed windlass mechanism of the plantar aponeurosis must be important in normal function of the toes.