Zifchock Rebecca Avrin, Theriot Christal, Hillstrom Howard J, Song Jinsup, Neary Michael
J Am Podiatr Med Assoc. 2017 Mar;107(2):119-123. doi: 10.7547/15-051. Epub 2017 Feb 15.
The correlation between arch structure and injury may be related to the fact that foot structure influences foot function. Foot structure is often defined by arch height, although arch flexibility may be just as important to form a more complete description. We propose an arch flexibility classification system, analogous to arch height classification, and then use the classification system to examine the relationship between arch flexibility and arch height.
Arch height index was calculated in 1,124 incoming military cadets, of whom 1,056 had usable data. By measuring arch height during both sitting and standing, a measurement of arch flexibility could also be calculated. These values were used to create five arch flexibility categories: very stiff, stiff, neutral, flexible, and very flexible. The distribution of arch flexibility types among arch height categories was statistically compared.
The goodness of fit test showed a disproportionate number of each arch flexibility type in each of the arch height categories (P < .01). The largest proportion of cavus feet was very stiff and the smallest proportion was very flexible. Conversely, the largest proportion of planus feet was very flexible and the smallest proportion was very stiff.
The results of this research support the common belief that cavus feet tend to be very stiff and planus feet tend to be very flexible.
足弓结构与损伤之间的相关性可能与足部结构影响足部功能这一事实有关。足部结构通常由足弓高度定义，尽管足弓柔韧性对于形成更完整的描述可能同样重要。我们提出一种类似于足弓高度分类的足弓柔韧性分类系统，然后使用该分类系统来研究足弓柔韧性与足弓高度之间的关系。
计算了1124名入伍军校学员的足弓高度指数，其中1056人有可用数据。通过测量坐姿和站姿时的足弓高度，还可以计算出足弓柔韧性的测量值。这些值被用于创建五个足弓柔韧性类别：非常僵硬、僵硬、中性、灵活和非常灵活。对足弓高度类别中足弓柔韧性类型的分布进行了统计学比较。
拟合优度检验显示，每个足弓高度类别中每种足弓柔韧性类型的数量不成比例（P <.01）。高弓足中比例最大的是非常僵硬，比例最小的是非常灵活。相反，扁平足中比例最大的是非常灵活，比例最小的是非常僵硬。
本研究结果支持一种普遍观点，即高弓足往往非常僵硬，扁平足往往非常灵活。
