Hello,

The US report says that all the muscles of the Wikipedia reference-linkrotator cuff (if we include the biceps tendon also) are intact - no large tears. This is a good start at least but following that it says all the muscles of your rotator cuff are calcified - meaning the muscle has taken up clacium. Basically the muscle has areas where it has hardened, this will cause pain and decrease your function. Then it goes on to say the tendons are diseased and thickened - again this is going to cause pain, and my guess is that it's a result of a chronic inflammation of those tendons.

I can only assume that, as your considering surgery the function of your shoulder isn't good - and i'm not surprised based on the US report.
As to what the surgery will acheive? No idea, you have to discuss prognosis with your orthopaedic consultant and if your dissatisfied consider a second opinion - As in any profession (physio no exception) there is a huge range of expertise. I would suggest you form a good relationship with a local physio such that you can discuss your results - you of course need to find one that is experienced in orthopaedics. I have no idea how much physio you'v had on your shoulder if any. But its certainly not the worst idea to go see one, and if they feel your shoulder is past physio input then they'll let you know.

Hopefully that explained the US report for you.