If you want to try everything before surgery. I suggest you check this out.
www.frozenshoulder.com. It's a Dr in England that is clinically proven to work. It's using the trigger points in the body.
Here's a brief summary of how it works:
Changing the way the brain and body communicate.
The brain responds to shoulder injuries by ‘switching off’ normal muscular co-ordination. In a frozen shoulder we call this the ‘capsular pattern’; this is where the arm is held in a sling-like position with the shoulder raised. All shoulder problems manifest this ‘switching off’ in one way or another, but in the frozen shoulder it is most apparent. The brain is at the centre of this – and it is the brain where The Niel-Asher technique works. By stimulating a sequence of reflexes hidden in the muscles, the technique sends new messages to the brain. It responds quickly by using the correct muscles and re-setting those forgotten movement patterns. It is a bit like putting in a new piece of software and re-booting the system!