Chuckpaiwong Bavornrit, Nunley James A, Mall Nathan A, Queen Robin M
Department of Surgery, Division of Orthopaedic Surgery, Duke University, Durham, NC 27710, United States.
Gait Posture. 2008 Oct;28(3):405-11. doi: 10.1016/j.gaitpost.2008.01.012. Epub 2008 Mar 11.
The purpose of this study was to determine if low arch feet have altered plantar loading patterns when compared to normal feet during both walking and running. Fifty healthy subjects (34 normal feet, 16 flat feet) walked and ran five trials each at standard speeds. In-shoe pressure data were collected at 50 Hz. Contact area, peak pressure, maximum force, and force-time integral were analyzed in eight different regions of the foot. Foot type was determined by examining navicular height, arch angle, rearfoot angle, and a clinical score. A series of 2 x 2 repeated measures ANOVAs were used to determine statistical differences (alpha<0.05). A significant interaction existed between foot type and movement type for the maximum force in the medial midfoot. Total foot contact area, maximum force and peak pressure were significantly increased during running. Contact area in each insole area, except for the rearfoot, was significantly increased during running. Peak pressure and maximum force were significantly increased during running in each of the foot regions. However, the force-time integral was significantly decreased during running in the rearfoot, lateral midfoot, middle forefoot, and lateral forefoot. Significant differences between foot types existed for contact area in the medial midfoot and maximum force and peak pressure in the lateral forefoot. The maximum force and peak pressures were significantly decreased for the flat foot type. Therefore, individuals with a flat foot could be at a lower risk for lateral column metatarsal stress fractures, indicating that foot type should be assessed when determining an individual's risk for metatarsal stress fractures.
本研究的目的是确定与正常足相比，扁平足在行走和跑步时足底负荷模式是否发生改变。50名健康受试者（34只正常足，16只扁平足）以标准速度分别进行5次行走和跑步试验。以50赫兹的频率收集鞋内压力数据。在足部的八个不同区域分析接触面积、峰值压力、最大力和力-时间积分。通过检查舟骨高度、足弓角度、后足角度和临床评分来确定足型。使用一系列2×2重复测量方差分析来确定统计学差异（α<0.05）。内侧中足的最大力在足型和运动类型之间存在显著交互作用。跑步时总足接触面积、最大力和峰值压力显著增加。除后足外，每个鞋垫区域的接触面积在跑步时均显著增加。每个足部区域在跑步时峰值压力和最大力均显著增加。然而，后足、外侧中足、中前足和外侧前足在跑步时力-时间积分显著降低。内侧中足的接触面积以及外侧前足的最大力和峰值压力在足型之间存在显著差异。扁平足类型的最大力和峰值压力显著降低。因此，扁平足个体发生外侧跖骨应力性骨折的风险可能较低，这表明在确定个体发生跖骨应力性骨折的风险时应评估足型。
