Comparison of ankle joint contact force of the flatfoot and normal during walking

The talar articular surface was divided into medial and lateral areas. Three force reaction elements were embedded in each area to calculate the contact force in the tibiotalar joint. Walking data of normal and flatfoot were measured using motion capture, force plate, and pressure mat. We performed a musculoskeletal simulation using a five-segment foot model. The total ankle contact force of flatfoot was 31% larger than normal. Medial and lateral ankle contact forces were 18% and 56% larger, respectively, in the flatfoot.