Flat arches in children usually become high arches as the child progresses through adolescence and into adulthood. The human arch develops in infancy and early childhood as part of normal muscle, tendon, ligament and bone growth. Studies have shown flat feet are a common occurrence in children and adolescents. Children Foot with a typical arch Flat feet of a child are usually expected to develop into high or proper arches, as shown by feet of the mother. This latter condition is often treated with arch supports. If the MLA is present and functional while the individual is sitting or standing up on their toes, but this arch disappears when assuming a foot-flat stance, the individual has "supple" flatfoot. If the MLA is absent or nonfunctional in both the seated and standing positions, the individual has "rigid" flatfoot. As a result, the plantar calcaneonavicular ligament (spring ligament) and the tendon of the tibialis posterior muscle are stretched to the extent that the individual with pes planus loses the function of the medial longitudinal arch (MLA). In pes planus, the head of the talus bone is displaced medially and distal from the navicular bone. The arch provides an elastic, springy connection between the forefoot and the hind foot so that a majority of the forces incurred during weight bearing on the foot can be dissipated before the force reaches the long bones of the leg and thigh. There is a functional relationship between the structure of the arch of the foot and the biomechanics of the lower leg. Sometimes children are born with flat feet (congenital). Flat feet, also called pes planus or fallen arches, is a postural deformity 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.
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