@simrin-- Yes, this surgery is not a very common one and it might take some searching to find a skilled surgeon who has experience with it. We live in New York and we are lucky to have several such doctors here.
If I remember correctly, my dad's surgeon said that the success rate is around forty to forty-five percent. But if you work with a surgeon who is experienced in this area, I think the success rate is higher.
But you have to keep in mind that even after surgery, you have to take it easy. You can't be extremely active and engage in demanding sports as that might affect recovery and health of your foot. You should wear protective equipment as necessary, as well as special shoes for flat feet. So the surgeon is definitely important, but so is how you take care of yourself afterward.