成年柔性扁平足动静态足弓功能探究.

Objective：To explore the characteristics of arch function in patients with flexible flat foot by comparing the differences of static and dynamic arch function between normal and flexible flat foot patients, provide theoretical reference for the functional distinction of different types of foot arch. Method：Thirty adult male subjects were recruited. Normal and flat feet were distinguished by foot printing method, and flexible flat feet were screened by heel raising test and passive toe raising test. Sixteen normal feet and fourteen patients with flexible flat feet were screened. Static arch stiffness was calculated by the difference of arch height between natural standing and sitting at different loading positions, and the relative arch height at the beginning of the middle support period, change value of relative arch height, change rate of relative arch height and proportion of middle foot impulse during walking were evaluated by 3D motion capture and plantar pressure. The correlation between static arch stiffness and dynamic arch function was analyzed by partial correlation(controlling step speed). Result：The static arch stiffness of flexible flat feet was lower than that of normal feet (P<0.05). The results of dynamic arch function test showed that the relative height and change rate of arch height in the middle of walking support decreased gradually in both normal and flexible flat feet, the change value and change rate of arch height in flexible flat feet at the beginning of the middle of walking support period were lower than those in normal feet (P<0.05). The proportion of impulse of flexible flat feet in walking support was higher than that of normal feet (P<0.05). Partial correlation analysis showed that the relative height, relative height change value and relative height change rate at the beginning of middle support were positively correlated with static arch stiffness (r=0.580—0.679, P<0.05), the proportion of middle foot impulse was negatively correlated with static arch stiffness(r=﹣0.478, P<0.05). Conclusion：During walking, the arch of the foot continued to decline in the middle of support, and the rate of decline gradually decreased. The adaptability of static and dynamic arches to loading in patients with flexible flat feet was lower than that of normal feet. It is the key of ankle rehabilitation to improve the weight bearing adaptability of arch in patients with flexible flat foot. Arch stiffness is correlated with dynamic arch function, which is an important reference value for the functional division of different types of foot arch. [ABSTRACT FROM AUTHOR]