The term flat feet (also called a fallen arch) is a medical condition in which human foot arches are very low or the entire sole of the human foot is touching the ground.
Flat feet in children may become regular arches later on.[1] Adults with this condition may have problems involving arch development.
Lateral X-ray of a flat foot with C-sign, which is a bony bridge between the talar dome and sustentaculum tali, in combination with a prominent inferior border of the sustentaculum tali. This represents a talocalcaneal coalition, which is an abnormal connection between the talus and calcaneus and is thought to cause the flat foot deformity in this case.[2]
The opposite, less common condition is called high arch.
References
↑Franco, Abby Herzog 1987. Pes Cavus and Pes Planus analyses and treatment. Physical Therapy67 (5): 688–94. [1]
