The arch is an important structure of the human foot. With it, the feet are resilient. It can absorb the impact force of the ground on the foot, and also lock the midfoot joint, so that the foot becomes harder to promote human activities. Flatfoot (tarsoptosis) refers to the absence of a normal arch, also called arch collapse. It's worth noting that flatfoot does not equal to a syndrome, and not all flat feet require treatment. When a flat-footed person combines symptoms such as pain, it is called flat-footedness and may require treatment. In fact, flat-footed people are very common, while flat foot syndrome is not. Many flat-footed people, especially children, have no symptoms and do not need treatment, and only a minority of children have flat feet that may cause gradual changes in their entire body posture. Some people who love to play sports but are flat-footed can be greatly improved by using soccer insoles for flat feet. A portion of the flat foot may merge with abnormalities in the bone structure of the foot, such as the vertical spur, tarsal union, and so on. Among adults with flat feet, there are more women over the age of 50. For initial adults with flat feet, the foot is non-weight-bearing where the arch exists, and the arch disappears after the weight-bearing state. At this point, because the activity of the joint remains, it is called a reversible flat foot or a flexible flat foot. If there are joint lesions, limited movement, and the deformity cannot be reset, it is called a rigid flatfoot.
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