[Static results of medial foot arch]

The purpose of this study was to examine the factors which influence on the length of the medial arch of the foot. The length of the medial arch was measured by using the electric arch gauge in ten normal adults under various situation, such as, under vertical load from the knee to the foot, under weight-bearing on both-legs standing, on one-leg standing with and without support, at the dorsiflexion of first metatarsophalangeal joint, and during the inversion-eversion and adduction-abduction of the foot. The medial arch lengthened by vertical load to the foot, and abduction of the foot. On the other hand, shortening was observed on one-leg standing without support on the dorsiflexion of the first metatarsophalangeal joint and on the adduction of the foot. These results indicate that the participation of these factors may be necessary for smooth walking.