![]() ![]() 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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