Flat foot is a disease that is either congenital or acquired, having characteristics such as talus medial rotation, decreased medial arch height, and forefoot supination and abduction1'. Flat foot also causes excessive movement to be pronated and shock absorption to be decreased. In general, a normal foot experiences a pressure 1.5 times body weight when in contact with the ground, whereas people with flat feet feel more fatigue because of the problem of shock absorption. Furthermore, researchers have explained the kinematic causes of flat feet. Flat foot is a dysfunction of the posterior tibial tendon, one of the important supporters of the medial arch, a dysfunction of the spring Iigament2',or an injury to the plantar fascia3'. It can also result from obesity increasing the load on the feet during the stance phase, causing abnormal foot movement4'. Obesity also puts greater stress on the knees5'.
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