Department of Mechanics, Royal Institute of Technology, Stockholm, Sweden.
Gait Posture. 2011 May;34(1):29-35. doi: 10.1016/j.gaitpost.2011.03.003. Epub 2011 Apr 6.
The purpose of this study was to determine how gait deviation in one plane (i.e. excessive subtalar inversion/eversion) can affect the dynamic function of the tibialis anterior, gastrocnemius, and soleus to accelerate the subtalar, ankle, knee and hip joints, as well as the body center of mass. Induced acceleration analysis was performed based on a subject-specific three-dimensional linkage model configured by stance phase gait data and driven by one unit of muscle force. Eight healthy adult subjects were examined in gait analysis. The subtalar inversion/eversion was modeled by offsetting up to 20° from the normal subtalar angle while other configurations remained unaltered. This study showed that the gastrocnemius, soleus and tibialis anterior generally functioned as their anatomical definition in normal gait, but counterintuitive function was occasionally found in the bi-articular gastrocnemius. The plantarflexors play important roles in the body support and forward progression. Excessive subtalar eversion was found to enlarge the plantarflexors and tibialis anterior's function. Induced acceleration analysis demonstrated its ability to isolate the contributions of individual muscle to a given factor, and as a means of studying effect of pathological gait on the dynamic muscle functions.
本研究旨在探讨单一平面的步态偏差（即过度的跟骨内翻/外翻）如何影响胫骨前肌、腓肠肌和比目鱼肌的动力功能，以加速跟骨、踝关节、膝关节和髋关节以及身体质心的运动。通过基于站立相步态数据配置的特定于个体的三维连杆模型，并由一个单位的肌肉力量驱动，进行了诱导加速度分析。对 8 名健康成人进行了步态分析。通过将跟骨角度从正常角度偏移最大 20°来模拟跟骨内翻/外翻，而其他结构保持不变。本研究表明，在正常步态中，腓肠肌、比目鱼肌和胫骨前肌通常按其解剖定义发挥作用，但在双关节腓肠肌中偶尔会发现违反直觉的作用。跖屈肌在身体支撑和向前推进中起重要作用。过度的跟骨外翻会增大跖屈肌和胫骨前肌的作用。诱导加速度分析证明了其能够分离单个肌肉对特定因素的贡献的能力，并且可以作为研究病理性步态对动力肌肉功能影响的一种手段。
