A flat foot is a postural deformity in which the arches of the foot collapse. This usually occurs in childhood and is a painless condition. Sometimes, the entire sole of the foot comes into contact with the ground. Flatfeet can sometimes contribute to problems in the ankles and knees because the condition can alter the alignment of your legs.
Damage or inflammation of the posterior tibial tendon, which connects the lower leg, along the ankle, to the middle of the arch, causes flat foot. Research showed that flat feet occurs due to increased activity of proteolytic enzymes that breakdowns the tendons of the foot causing them to lose their arch.
Treatment of flat feet may also be appropriate only for those who have associated foot or lower leg pain, or if the condition affects the knees or the lower back. The treatment is basically physical in nature involving arch supports and other measures.
About 60 percent of all foot and ankle injuries, reported by the U.S. population older than 17, were sprains and strains of the ankle. Less than 5% of the population have flat feet. The prevalence of foot pain and foot deformity in adolescent is high.