What is rotator cuff disease anyway?
I submit no such disease exists. You might as well talk of shoulder pain disease or the long discredited periarthritis. The diagnostic criteria seem to be pain on abduction (active or passive or both?), up to 49% reduced glenohumeral motion in one direction only (active or passive limitation, or both?), with pain on two resisted movements, and a positive impingement sign (a painful arc?). What is the basis for deciding that this complicated combination of physical signs correlates with rotator cuff disease? But if it does, what is the logic of trying to treat it by injecting into the subacromial bursa, a different structure? The rotator cuff consists of the tendons of the supraspinatus, infraspinatus, subscapularis, and teres minor muscles . . .
