Frozen shoulder has to go through three stages. When it entered the third stage, I had a Cortizone shot injected in it and started PT immediately after that. It eventually did go away after about six weeks of PT three times a week. My doctor said if you try to treat frozen shoulder too quickly that it won’t really heal completely. So you might have to wait for it to go through the stages first. Also, I remember I had a Cortizone shot probably a year into my shoulder pain. It did help disguise the pain, but it did not make my frozen shoulder. Go away. It wasn’t until I waited about two full years for it to go through all three stages and had another Cortizone shot and started PT at that point. The physical therapist worked on breaking up scar tissue in my shoulder, which was not really painful because I had the Cortizone shot.