During my 60 yrs with Type 1, I have had two frozen shoulders. One was treated with massage and physical therapy for many months until a doctor shot me with painkillers and literally got on top of and tore the shoulder apart. I felt better almost immediately.
When I had another frozen shoulder I asked a different doctor to do the same procedure and he was aghast about what the other orthopedic surgeon had done. If I remember correctly I had a steroid shot and ignored the arm. Both arms healed well.
Since keeping my A1c below 5.5 for the last 20 yrs, I have not had any more problems with frozen shoulders, trigger fingers, carpal tunnel, or dupuytren’s contracture.