We call “flat foot” a foot whose arch is slumped and touches the ground. This condition may affect the foot’s function when it’s stationary (and the person is standing up) or during the process of walking.
The causes of flat feet are numerous, but generally have to do with heredity. The diagnosis of flat foot can only be given after the age of 3, because a young child’s feet are too “wrapped up” to allow it beforehand.
Flat foot increases the risk of developing foot, leg, and knee pain, and sometimes causes spine problems.
TREATMENT OF FLAT FOOT
To treat flat foot, the podiatrist generally prescribes plantar orthoses. For children above 3, the orthosis is used for corrective purposes, whereas in the case of an adult, the orthosis is used to relieve pain and discomfort.
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Source : Ordre des podiatres du Québec