I have had surgery on both shoulders both in different stages of freezing. I had very different outcomes on both. The first, was well advanced into the last stage of freezing and I had a great outcome, good recovery and now only somewhat limited to behind the back motion. The second shoulder, was early in the onset, during the first stage, which produced little effect on movement and pain, even with all the physical therapy and home exercises.
I have decided that the difference between the two outcomes had to do with the stage of freezing. For well over a year I had been told that this was an inflammatory process and it would run its course. And now I believe that's what happened with the second surgery. The inflammation continued to run its course despite the surgery. Cutting the adhesion's, which is what the surgery is, does not stop the inflammatory process.
Of course, this is only my experience. But I know how desperate I was after so long with so much pain, loss of work, depression, etc... Even with a not so great outcome for the second shoulder, at the time, having the use of my dominant arm back was a life changer.
And yes, control is key. I was never more motivated to take care of myself than I was when I had frozen shoulder and the need to prevent future problems. There are other musculoskeletal complications that can occur with long term high blood sugars. Tendonitis occurs commonly in the hands and fingers causing trigger finger, deQuervains and other types of tendonitis.