All this makes me very nervous. Your surgeon's recommendations are reasonable. Before deciding whether to have surgery, weigh your discomfort and decrease in function and mobility against the chances of success with the procedure. Ask what problems will you have if you do not have the operation. Ask your surgeon how many times he has done this operation and what success rate he has had.
Some orthopaedic surgeons specialize in non-union repairs.
Finally, ask about possible complications and risks before making your decision. 882-7000 to make an appointment with a University of Missouri Health Sciences Center physician. Heel spurs I have a callus or bump on each heel. They are not painful but they tear up my athletic shoes and socks. I've had these bumps for years.