Which rotator cuff tendon is most commonly torn?

• A. Infraspinatus
• B. Subscapularis
• C. Teres minor
• D. Supraspinatus

Answer: (D)

The supraspinatus tendon is the most commonly torn among the rotator cuff. Its location at the top of the shoulder, just under the acromial arch, makes it particularly susceptible to repetitive compression during arm elevation, leading to impingement and accumulative microtrauma. In addition, the region near its insertion on the greater tuberosity—often called the critical zone—has limited blood supply, so degeneration and tears occur more readily with aging and overhead use. These biomechanical and vascular factors together explain why this tendon tears most often. Tears of the other cuff tendons do occur, but with lower frequency; clinically, a supraspinatus tear presents with pain during overhead activity and weakness in initiating abduction, often with a positive empty-can test.