Hi there!
I had a frozen shoulder for quite a long time, and very painful it was too! I had an injection and then when that was unsuccessful, my shoulder was manipulated under anesthestic. This wasn't successful, until quite a while later, we were on holiday, and my husband had to see a private doctor because he was unwell. This doctor specialised in joint problems, My husband mentioned my frozen shoulder, the doctor said he would be able to help me. He did, by injecting my shoulder, it worked a treat. My shoulder has been fine for a number of years. Hurrah!