What is the purpose of the AC compression test?

• A. To assess acromioclavicular joint pathology.
• B. To assess rotator cuff tear.
• C. To assess glenoid labrum tear.
• D. To assess bicipital tendinitis.

Answer: (A)

The AC compression test directly stresses the acromioclavicular joint. By pressing the clavicle downward toward the spine while the shoulder is stabilized, the AC ligaments (and the joint itself) are loaded. If there’s pathology such as an AC joint sprain or arthritis, this maneuver typically reproduces pain or tenderness at the AC joint, signaling involvement of that joint.

This is the best fit because the other structures listed—rotator cuff tendons, the glenoid labrum, and the biceps tendon—are evaluated with different tests specific to those tissues (for example, tests like the empty can or drop arm for the rotator cuff; O'Brien or other maneuvers for a labral tear; Speed’s or Yergason’s tests for the biceps).