Robert
I have had my rotator muscles repaired in both my shoulders; one was a 3/4 tear and the other was a full tear with bicep tendon tear. I returned to playing sports with no limitations. I would refer you to the doctor that did mine but he retired due to medical reasons. My suggestions to you is find out what doctor your local professional baseball team uses and start there. If that doesn't work then read Sports Ilustrated there is always some pitcher having surgery done. No one knows the rotator muscle better than sports doctors. Also, you probably need a subacromial (sp) decompression done in your shoulder. Simple procedure which will give you more space in your shoulder to prevent future problems. Good luck