I developed this condition about fourteen years after a fall resulted in a dislocated shoulder which was never properly treated. I was in terrible pain and had little mobility in my left arm.
I tried doctors and chiropractors to no avail. In desperation I went to a rolfer. In the first session, he broke the adhesion that was causing all my trouble. It sounded like a tree branch snapping. The instant relief from constant pain was indescribable.
I don't know if rolfing would cure every case, but it cured mine!