My dad had a new shoulder about five years ago. He now has fullish mobility but not full strength. You do have to bear in mind that under the English NHS he had to have been unable to use the arm at all for some considerable time before they did anything. Consequently his muscles had atrophied badly and he had to start virtually from scratch with his physio. He still reckons it was well worth while and once he has a shiny new hip to go with his bionic knees he should be running around by the summer (maybe).
Glad you seem to be doing so well Louis