My right shoulder locked up about 6 years ago. Took a number of doctors to finally figure out what was wrong, and I then started seeing a sports medician doctor. He knew right away what was going on, and recommended PT to start. I did very painful PT for about 3 months with little improvement. He then recommend "manipulation surgery", which is where they put me out, then the doc litterally broke the frozen muscules by moving my arm where it would not move before. In his words "move the arm until it goes "SNAP!", and all the nurses in the room shudders from the sound." The first surgery was bad, as the pain block didn't work right and I was out of it for 2 weeks. It took about 6 months recovery and more PT, but I finally gained back 90% of the movement in my right arm. That from as little as 20% movement.
2 years ago my left shoulder started acting up. I went back to the same doctor, and he agreed that it was back to manipulative surgery. I was ready for it this time, I figured a few months of pain were better than what I was going through now and would continue to go through. This time the surgery went much better. The pain block was done with ultrasound to get it right and it worked. However, this time I only gained about about 70% of the movement. I figure it is due to not having PT before, and not much after the surgery. PT is painful, but DO IT! It will make all the difference in the world!
So, today I'm actually using massage therapy to help out. No pain, just some movement issues in my left shoulder. But the place I currently work for pays for massage therapy for all it's office staff as a bonus, so I'm taking 100% advantage of that perk. The therapist is good, and knows how to work these types of muscle problems. It's not as good as the surgery, but it does help quite a bit.
Frozen shoulder is painful. And the cure is even more so. But stick to it, 110% and you will be so much better off. If I'd done even near to my left shoulder what I did to my right I would be in great condition today. Basically I had to learn the hard way that the PT is key and extremely important to do as much as you can handle.