I disagree with doing replacement on old patients. A young person would have longer to benefit from the replacement, Having said that, the replacements still don't work well. With a good doctor (orthopedic surgeon ankle specialist) the fusion is a good option. You'll lose a half inch of leg length in the process and the four month recovery is a pain. Another option is the external fixator which runs wires through bones to an external frame. It too is 3 or 4 months, but you can walk without crutches or walker. The frame is heavy and bulky, but YOU CAN WALK.
Walking on a fused ankle is little different from walking on a normal ankle. Shoes with fairly round toes and heels (New Balance) are recommended. Running is a challenge (I can't and I'm 66 and don't care). No tiptoes. Otherwise, it is great and there is no pain. I had a very skilled surgeon.

