Periyasamy R, Anand Sneh
Center for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi, India.
J Med Eng Technol. 2013 Jul;37(5):342-7. doi: 10.3109/03091902.2013.810788.
The aim of this study was to explore how foot type affects plantar pressure distribution during standing. In this study, 32 healthy subjects voluntarily participated and the subject feet were classified as: normal feet (n = 23), flat feet (n = 14) and high arch feet (n = 27) according to arch index (AI) values obtained from foot pressure intensity image analysis. Foot pressure intensity images were acquired by a pedopowergraph system to obtain a foot pressure distribution parameter-power ratio (PR) during standing in eight different regions of the foot. Contact area and mean PR were analysed in hind foot, mid-foot and fore foot regions. One-way analysis of variance was used to determine statistical differences between groups. The contact area and mean PR value beneath the mid-foot was significantly increased in the low arch foot when compared to the normal arch foot and high arch foot (p < 0.001) in both feet. However, subjects with low-arch feet had significantly higher body mass index (BMI) compared to subjects with high-arch feet (p < 0.05) and subjects with normal arch feet (p < 0.05) in both feet. In addition, subjects with low-arch feet had significant differences in arch index (AI) value as compared to subjects with high-arch feet (p < 0.001) and subjects with normal arch feet (p < 0.05) in both feet. Mean mid-foot PR value were positively (r = 0.54) correlated with increased arch index (AI) value. A significant (p < 0.05) change was obtained in PR value beneath the mid-foot of low arch feet when compared with other groups in both feet. The findings suggest that there is an increased mid-foot PR value in the low arch foot as compared to the normal arch foot and high arch foot during standing. Therefore, individuals with low arch feet could be at high risk for mid-foot collapse and Charcot foot problems, indicating that foot type should be assessed when determining an individual's risk for foot injury.
本研究的目的是探讨足型如何影响站立时足底压力分布。在本研究中，32名健康受试者自愿参与，根据从足底压力强度图像分析获得的足弓指数（AI）值，将受试者的脚分为：正常足（n = 23）、扁平足（n = 14）和高弓足（n = 27）。通过足底压力测量系统采集足底压力强度图像，以获取站立时足部八个不同区域的足底压力分布参数——功率比（PR）。分析后足、中足和前足区域的接触面积和平均PR。采用单因素方差分析来确定组间的统计学差异。与正常足弓和高弓足相比，低弓足双脚中足下方的接触面积和平均PR值显著增加（p < 0.001）。然而，与高弓足受试者（p < 0.05）和正常足弓受试者（p < 0.05）相比，低弓足受试者双脚的体重指数（BMI）显著更高。此外，与高弓足受试者（p < 0.001）和正常足弓受试者（p < 0.05）相比，低弓足受试者双脚的足弓指数（AI）值存在显著差异。中足平均PR值与足弓指数（AI）值增加呈正相关（r = 0.54）。与其他组相比，低弓足双脚中足下方的PR值有显著（p < 0.05）变化。研究结果表明，与正常足弓和高弓足相比，站立时低弓足的中足PR值增加。因此，低弓足个体可能有较高的中足塌陷和夏科氏足问题风险，这表明在确定个体足部受伤风险时应评估足型。
