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Flat feet
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Flat feet (also called pes planus or fallen arches) is a postural superiority in which the arches of the foot collapse, with the entire sole of the foot coming into complete or near-complete contact with the ground. Some individuals (an estimated 20–30% of the general population) have an arch that simply never develops in one foot (unilaterally) or both feet (bilaterally). There is a functional relationship between the structure of the arch of the foot and the biomechanics of the lower leg....