well i can tell you mine healed after cortisone and I managed to not need surgery. But no matter how much PT/exercise/stretching I did up until the cortisone, nothing helped.

Within a few months of cortisone it felt great and didn't have mobility issues (I had scar tissue buildup that was cuasing trigger finger too) and now a year and a bit later its 100% functional with no pain and full mobility/range.

worth a try.