Comparison of dynamic and semidynamic balance of a flat foot with a normal foot

Considering to the anatomical structure of the foot and position it at the bottom of the chain mobility of the lower extremities and also relied on a relatively small area on the body maintains its balance, it seems that smallest changes biomechanical in level of support affect on postural control. The aim of the present study was to investigate the dynamic and semidynamic individuals who have a flat foot. In this study, of the 86 children with flexible flat foot, 15 subject with a mean age (10.06 ± 0.45), Height (123.30 ± 8.24) and Weight (26.25 ± 4.98) Were targeted to non-random. The control group included 15 children with normal feet that of terms of anthropometric indices were homogeneous with flat foot groups, were targeted to non-random. dynamic balance with the Star Excursion Balance Test and semidynamic balance was measured with the Biodex Stability System. The results showed that subject with flat foot in semidynamic balance in direction of anterior - posterior (P < 0.01) and also in dynamic balance in direction anterior (P < 0.0001), posterior (P < 0.02) and internal anterior (P < 0.000) are significantly different between the two groups. According to the results of this study It seems, flat foot more is effective on balance anterior - posterior. This could be due to disruption of the posterior - anterior forces distribution exerted on the foot, Due to muscle weakness, especially Tibialis Posterior muscle weakness and subsequent stretching of the calcaneonavicular ligament that Responsible force distribution in the anterior and Posterior part of the foot.