I'm in the same boat from having my shoulder and brachial plexus torn apart in Iraq. Not only do I have joint damage, but I also have nerve damage. I still shoot my bow as my primary means of hunting. I have to draw a bit oddly, but it's functional. It took me 4 years to be able to draw a bow again after my injury, but 7 years to get back up to 70 pound draw. With today's technology you can still hunt and kill effectively with a 50 pound draw. What I would suggest is to get one of the bows with a wide range of draw weight adjustability and start at a low weight to rebuild your drawing muscles. Mission, PSE, Hoyt, Bowtech, Bear, Diamond all have bows like that. If you put your mind to it, then you'll get it done. Just start out at a really low weight. My guess is that you're shooting too high of a weight now and that's what's messing with your shoulder.
