Which test result is indicative of a torn rotator cuff?

A positive Drop Arm Test is indicative of a torn rotator cuff because this assessment specifically evaluates the ability of the rotator cuff muscles, particularly the supraspinatus, to maintain arm abduction. When the test is performed, the patient is asked to slowly lower their arm from an abducted position. If the arm drops suddenly or cannot be controlled, it suggests that there is significant weakness and potential damage to the rotator cuff, consistent with a tear.

In contrast, the other options do not indicate a torn rotator cuff. A negative Empty Can Test suggests that the supraspinatus muscle is functioning properly, and a positive Neer Test usually indicates impingement rather than an actual tear. Lastly, a normal ABER (Abduction-External Rotation) Test indicates that there is no significant impairment in the rotator cuff muscles. Thus, the Drop Arm Test is the most specific for identifying a rotator cuff tear.