However, you don't have to have a disability to have flat feet. They can be inherited from a parent, caused by wearing high heels and they are more common in people who have diabetes or high blood pressure. People who are overweight are also prone to flat feet due to greater weight loading and its affect on muscles. Half of all people with rheumatoid arthritis have flat feet.
In most cases it doesn't cause any discomfort and if that's the case, no treatment is required. Sometimes, though, feet without arches will cause pain in the feet, swelling and repetitive sprain injuries to the mid-foot (medial arch sprain). Hip pain or pain in the knees can also occur.
A small cut is made on the top of the foot over the unstable bones and metal wires or screws are attached to hold them in the correct position. Afterwards weight has to kept off the operated foot and you'll be placed in a cast or a splint for up to six months while you recover, so it isn't a quick fix and should be looked at as a last resort when other options would not or did not help.