Mager Fabian, Richards Jim, Hennies Malika, Dötzel Eugen, Chohan Ambreen, Mbuli Alex, Capanni Felix
Ulm University of Applied Sciences.
University of Central Lancashire.
J Appl Biomech. 2018 Dec 1;34(6):448-453. doi: 10.1123/jab.2017-0265.
Forefoot stiffness has been shown to influence joint biomechanics. However, little or no data exist on metatarsophalangeal stiffness. Twenty-four healthy rearfoot strike runners were recruited from a staff and student population at the University of Central Lancashire. Five repetitions of shod, self-selected speed level walking, and jogging were performed. Kinetic and kinematic data were collected using retroreflective markers placed on the lower limb and foot to create a 3-segment foot model using the calibrated anatomical system technique. Ankle and metatarsophalangeal moments and angles were calculated. Stiffness values were calculated using a linear best fit line of moment versus of angle plots. Paired t tests were used to compare values between walking and jogging conditions. Significant differences were seen in ankle range of motion, but not in metatarsophalangeal range of motion. Maximum moments were significantly greater in the ankle during jogging, but these were not significantly different at the metatarsophalangeal joint. Average ankle joint stiffness exhibited significantly lower stiffness when walking compared with jogging. However, the metatarsophalangeal joint exhibited significantly greater stiffness when walking compared with jogging. A greater understanding of forefoot stiffness may inform the development of footwear, prosthetic feet, and orthotic devices, such as ankle foot orthoses for walking and sporting activities.
前足僵硬已被证明会影响关节生物力学。然而，关于跖趾关节僵硬的数据很少或几乎没有。从中央兰开夏大学的教职员工和学生群体中招募了24名健康的后足着地跑步者。进行了五次穿着鞋子、自行选择速度水平的行走和慢跑。使用放置在下肢和足部的反光标记收集动力学和运动学数据，以使用校准解剖系统技术创建一个三段式足部模型。计算踝关节和跖趾关节的力矩和角度。使用力矩与角度图的线性最佳拟合线计算刚度值。使用配对t检验比较行走和慢跑条件下的值。踝关节活动范围存在显著差异，但跖趾关节活动范围没有显著差异。慢跑时踝关节的最大力矩明显更大，但在跖趾关节处这些力矩没有显著差异。与慢跑相比，行走时平均踝关节刚度明显更低。然而，与慢跑相比，行走时跖趾关节的刚度明显更大。对前足僵硬的更深入了解可能会为鞋类、假足和矫形装置（如用于行走和体育活动的踝足矫形器）的开发提供信息。
