The type of treatment depends on whether the flat feet are still flexible (can be actively corrected) or the defect has already been fixed. If we are dealing with flexible flatfoot, one of the methods used is to place a small implant in the tarsal sinus. The tarsal sinus is the space between the ankle bone and the calcaneus, felt through the skin as a depression in the foot in front of the lateral ankle. The procedure is a minimally invasive one, therefore the return to walking is much faster compared to classic correction methods. The implant placement procedure can be performed in children over 3 years of age and in adults with corrective flat feet. Fixed flat feet with degenerative changes in the foot and ankle are operated using other methods, the choice of which is up to the surgeon.