Muscles that influence knee flexion velocity in double support: implications for stiff-knee gait
Muscles that influence knee flexion velocity in double support: implications for stiff-knee gait
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DOI：
10.1016/j.jbiomech.2003.12.005
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发表时间：
2004-08-01
影响因子：
2.4
通讯作者：
Delp, SL
中科院分区：
文献类型：
--
作者：
Goldberg, SR;Anderson, FC;Delp, SL
足尖起始时足够的膝关节屈曲速度对于在步态中实现正常的摆动阶段膝关节屈曲是很重要的。因此，脱趾时膝关节屈曲速度不足会导致僵硬的膝关节步态，这是一种摆动阶段膝关节屈曲减少的运动异常。这项工作的目的是确定在正常步态下双支撑时膝盖弯曲速度的肌肉，以及最有可能改变这种速度的肌肉。通过在正常步态的前向动态模拟中干扰双支撑过程中单个肌肉产生的力，并观察扰动对膝关节屈曲速度峰值的影响，实现了这一目标。髂腰肌和腓肠肌被认为是在双支撑时对增加膝关节屈曲速度贡献最大的肌肉。在股肌、股直肌和比目鱼肌中增加力量会降低膝关节屈曲速度。在双支撑时，我们发现股肌、股直肌、腓肠肌和髂腰肌都有很大的潜力影响膝关节屈曲速度峰值。这项工作的结果表明，哪些肌肉可能导致在硬膝步态中观察到的膝关节屈曲速度降低，并确定最有可能增加硬膝步态患者屈曲速度的治疗策略。(C) 2003 Elsevier Ltd.版权所有。
Adequate knee flexion velocity at toe-off is important for achieving normal swing-phase knee flexion during gait. Consequently, insufficient knee flexion velocity at toe-off can contribute to stiff-knee gait, a movement abnormality in which swing-phase knee flexion is diminished. This work aims to identify the muscles that contribute to knee flexion velocity during double support in normal gait and the muscles that have the most potential to alter this velocity. This objective was achieved by perturbing the forces generated by individual muscles during double support in a forward dynamic simulation of normal gait and observing the effects of the perturbations on peak knee flexion velocity. Iliopsoas and gastrocnemius were identified as the muscles that contribute most to increasing knee flexion velocity during double support. Increased forces in vasti, rectus femoris, and soleus were found to decrease knee flexion velocity. Vasti, rectus femoris, gastrocnemius, and iliopsoas were all found to have large potentials to influence peak knee flexion velocity during double support. The results of this work indicate which muscles likely contribute to the diminished knee flexion velocity at toe-off observed in stiff-knee gait, and identify the treatment strategies that have the most potential to increase this velocity in persons with stiff-knee gait. (C) 2003 Elsevier Ltd. All rights reserved.