Supraspinatus-the muscles of the rotator cuff are the supraspinatus, infraspinatus, teres minor, and subscapularis. there are three progressive stages of impingement syndrome as a result of overuse. 1st young athletes who participate in sports that require repetitive overhead motions of the shoulder; no weakness or loss of motion is present. 2nd fibrosis and thickening of the tendon and subacromial bursa can occur, the pain becomes more constant and active motion may be limited by pain & any overhead movement exacerbates the symptoms. 3rd range of motion of the shoulder is usually decreased due to disuse or a partial rotator cuff tear and pathologically tendon degeneration and attrition may be present. the supraspinatus tendon is the most often involved in rotator cuff tendinopathy. the empty can test (or jobes sign) assesses the supraspinatus tendon against resistance. (chapter 115)