Centre of Foot Pressure in a Mediolateral Direction and Arch Ratio as a Reliable Measure for Flat-Footedness

Abstract

This study examined the relationship between foot arch ratio and centre of foot pressure in the mediolateral direction (CFP). Twenty women were divided into three groups with four, eight and eight participants, respectively, according to their foot arch ratio. Group 1 had an arch ratio of less than 11%, group 2 between 11% and 15%, and group 3 larger than 15%. The mean (SD) arch ratio of group 1 was 10.7 (0.2)%, group 2 11.8 (0.5)%, and group 3 16.7 (1.2)%, with the latter being significantly higher than that of the other two groups. CFPs of groups 1 and 2 were found to be significantly displaced to the medial side of the foot compared to that of group 3. These findings suggest that CFP in the mediolateral direction can be used as an assessment tool for persons with flat feet. The arch ratio may also be considered as a useful parameter when measuring for an arch support.