I had arthroscopic on the left because the tissue was torn off almost all the way around the ball, they put a plastic pin in it that dissolved over time, that was in 1993. It still bothers me at times.
I crushed the bones together on the right shoulder twice, once skiing the other doing a superman over the handle bars of my mountain bike. had it operated on in 1997, they detached the muscle from the bone cut a half inch off the bone to give me the gap back that is supposed to be there, then reattached the muscle.
Both surgeries were the worst fuckin pain I wouldn't wish on my worst enemy.
I did 500mg a week of deca last year ending in October and my shoulders have never felt better since before they were operated on. Would not recommend the deca until rehabbing for at least a year or two because when on deca you will get strength gains that will fuck you up worse if you muscles are not yet strong enough to lift the weight.
My 2 cents....