When I had a frozen shoulder it last for almost one year. They can put you out and rotate the shoulder or it can run it's course. My neighbor next door is a Doctor and he told me that once you get it one shoulder you will never have it again in the same shoulder. However, it can happen to the other shoulder. He had it both shoulders and opted for the rotation because of his medical practice. All I know is that it was the most painful experience I have ever had.