U,
I personally don't know anyone who has had a replacement, but it is not a widely done procedure, yet.
I do have personal experience in repair surgery. Unfrotunatly, I have had to have my rt. shouilder repaired via torn rotator and fractured clavical. Not once, but twice. I don't know how a shoulder joint replacement will be much of a benifit if the rotator is the cause of the problem.
If bone spurs are the problem, then yes a new joint might be in order, but the shoulder is a very diff. joint then the knee or hip.
I will tell you this much, the shoulder surgery was the worst of the surgeries I have had in my life. Give me the knee repairs anyday over the shoulder. Re-hab is / was terrible for me.
But to answer your question, It never stopped me from riding, I did have the work done in the Winter, so by the time I got better, it was riding season.
So if it is going to be done, I would make it a Winter time thing, a slower re-hab with no stress to get back to riding.
Good luck with your decision.
Ride safe all, and please, ATGATT.
Greg