My mother's feet began to turn inside out from RA and her orthopedic did a fusion of her left foot which was painful and she could not put weight on it for 4 months. She was totally down as with the RA she couldn't use crutches often so it was horrible time for her. It only worked for a year or so and then foot started turning again. I won't recommend any foot surgery.
My ortho wanted to do a foot fusion but my ra dr said no. It's a very painful procedure and you need to do lots of research etc. you will not have movement any longer (up and down and side to side) in that foot. I need it done but like I said my ra dr said no till I get older and so I have a foot brace to wear instead
The orthopedic surgeon that fixed my feet actually rebuilt them. He used bone grafts from my hip and titanium help my feet, repaired tendons and joints. Long surgeries and long recovery but it turned out very well. I have almost complete motion in both feet and little pain.