A few years ago I had what I was diagnosed by Kaiser-Permanente as a completely torn superspinatus. Here's a Wiki entry on the condition:
http://en.wikipedia.org/wiki/Rotator_cuff_tear
The diagnosis was based on the results of an MRI that was performed without any range of motion study. The old railroading ploy: Move from an MRI directly to orthopedic surgery. Next!
However, I thought I would check first with my old family physician, who wasn't just a GP, but also a world-renowned senior internist and lead man on the floor at Sequoia Hospital in Redwood City, California. After he put me through a full range of motion studies (his standard protocol), he stated unequivocally that my rotator cuff was not completely torn because I could hold my affected arm out in front of me at a right angle. With a complete tear, I wouldn't be able to do that. However, Kaiser was ready to operate on an interpretation of an MRI without any direct observation how my shoulder was actually operating. My old MD told me that in about 6 weeks it wouldn't hurt nearly as much.
Sure enough, he was right and now my left shoulder where I had the tear is completely healed, stronger even than my dominant right shoulder. IOWs: Those rotator cuff surgeries are being performed on a mass assembly line basis. Seems like a clear violation of the Hippocratic oath about "doing no harm" to a patient since those muscles take forever to heal up after surgery. They don't mention that of course in the large print. There's also the danger of nasty little side-effects - like a stroke - in any invasive surgical procedure that the orthopedic surgeons tend to minimize.
In any event, I'm glad I sought the seasoned second opinion of someone with 50 years experience in these matters. It's like my old M.D. said: "I don't know about that operation, but if I were you, I sure wouldn't go and get it". I think the medical system just catches you when you're in pain and railroads you down the path to surgery in the wink of an eye, whereas if you just waited a few weeks, the pain would subside and surgery wouldn't seem to be such a nice option.
And yes I completely agree with Herbie: most rotator cuff tears are TMS pure and simple. Now that I look back, I see that I got the rotator cuff tear at the same time I was experiencing a lot of stress in my life and also just after I had beaten myself into a lather finishing a book. What's that Steve Ozanich calls that scenario, The Calm after the Storm TMS? Easy to see this stuff in hindsight though. At the time, all you want is relief so you go to the conventional doctors and believe whatever they say.