Bill, Yes I was told they could remove it, but it was 3 slipping originally, and I thought that would be excessive.
My anes/pain doc didn't use nitrogen. He killed it with something else that worked. They can burn them too. I'll bet your's could be re-done. They might have just mised the right branch. My guy spent a lot of time figuring out which places to inject. He did 3. When he injected anesthetic to the nerve he asked me to tell him when the ribs stopped hurting.
My pain is back, but it's tolerable for now with the pain meds I take for everything else. One rib, maybe a second still slipping, but not 24/7 like before. Mine are still disconnected at the tip where they were ripped loose from the costal cartilage (not really cartilage at my age, it's bone now).
Since there's a skin numbing shot, and more anesthetic going deeper, I can't imagine why they can't do an ablation.