Good luck with the surgery, Edwin. Fortunately my shoulders are OK (pretty much alone among my body parts), but Florence had her left RC repaired in '98, right RC repaired in '13, right total replacement in '15, and left total today. (Told her it would have been easier to dump her & find a trophey wife than to replace her a piece at a time).
Peter (who needs to stop typing & get some sleep to go back to the hospital bright & early - night, all)