I had a "frozen" shoulder and did he massgae therapy, physio, cortisone injections for a year, had the shoulder ripped under anaesthetic. Finally after 18 months of pure pain and helplessness on my left side, the surgeon went into the shoulder and removed the acromium-clavicular ligament that was impinged between the bones. He said a torn rotator cuff would have been a better problem. That was in 1994 and now my "bionic" shoulder never causes a problem - strong and flexible.
Good luck with yours. Be patient and do your follow up therapies religiously