The first treatment to try is hydrodilatation, with anaesthetic and a small amount of cortisone, then immediate range of motion exercises. The treatment can be repeated in 8 to 12 weeks if needed. Be aware that a capsular tear will stop a hydrodilatation from being successful.
If a patient has had greater than 6 months of Wikipedia reference-linkfrozen shoulder, night pain, restricted flexion and internal rotation, this technique should be tried - by experienced Doctors or radiologists.
MrPhysio