The distributed plantar vertical force of neutrally aligned and pes planus feet.

The distributed vertical ground reaction forces were determined for a normative population and contrasted with data from subjects with flat feet. Nineteen asymptomatic subjects, 11 with a neutrally aligned foot type (normal arch) and 8 with a pes planus foot type (low arch), were studied as they walked barefoot across a pressure plate. The pressure plate data were converted to force values at seven locations (subhallucal, five submetatarsal and subcalcaneal) on the plantar aspect of the foot. The distributed loading pattern of the plantar soft tissue throughout the stance phase of gait was determined. Pes planus feet had significantly more force at the subhallucal area with no difference seen under the other areas. These data are indicative of aberrant first ray mechanics in pes planus feet.