The arch volume index showed a declining trend as age increased. The navicular height ranged from 15.75 to 27 mm, the arch volume when sitting ranged from 6,223 to 11,630 mm 3, and the arch volume when standing from 3,111 to 7,848 mm 3 from two to six years of age. The arch volumes when sitting and standing were highly correlated with the navicular height. The differences of measured parameters between each aged group were analyzed by one-way ANOVA. The arch volume index, which represents the ratio of the difference in volume between sitting and one leg standing positions to the volume when sitting was calculated to demonstrate the flexibility of the foot arch. The navicular height was measured with one leg standing, and both feet were scanned separately in both sitting and one leg standing positions to compute the foot arch volume. MethodsĪ total of 44 children aged from two to six years of age were put into five age groups in this study. Our aims of this study were to establish a new method to evaluate the foot arch from a three dimensional perspective and to investigate the flexibility of the foot arch among children aged from two to six. To date, a universally accepted evaluation method of the foot arch in children has not been completely established. The prevalence of flexible flatfoot is high among preschool-aged children, but the effects of treatment are inconclusive due to the unclear definitions of normal flatfoot.
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