there are other options i'd pursue before surgery.
getting into a daily stretching and pt routine is what saved my long time 'frozen shoulder' from the scalpel.
lotsa times the problem isn't really in the painful area, it's instigated from somewhere else.
since doing the pt exercises, stretching, therapeutic massage and chiropractic, there is no need for cutting me up at all and i'm back to my 55# bows and feeling/shooting great.
there are homeopathic 'meds' that can help as well. never believed in that stuff 'til i found one that absolutely worked for me, and continues to help. it's an anti inflammatory gel called 'traumeel' - it works. use it three times a day on yer shoulder, in addition to the pt and stretching.
best of luck.