There's torn rotator cuffs, and then there's TORN rotator cuffs. Many people can heal up fine with small tears through conservative therapies, but other's need that repair. That's why we pay the surgeons the big bucks...to make that determination and fix it up for us.
Page, hope you heal up well and fast. BTW, was the spur off of the bottom of the acromion? I've seen a bunch of tears from similar causes. If so, glad they got that spur out of there.
I've got some problems with psoriatic arthritis myself (a lesser cousin of rheumatoid arthritis). It's finally gotten bad enough to mess with me on a daily basis, so I've got an appointment with a rheumatologist in May to see what I need to do. Hopefully it won't set me back from being able to learn forging on the new (to me) anvil I've got coming in.
God speed on the recovery, Page!
--nathan