Which test is performed with the patient seated, the shoulder flexed to 90 degrees, and the arm horizontally adducted, with pain at the AC joint during the maneuver?

• A. Allen's test
• B. Cross body adduction
• C. Military Brace test
• D. Adson's test

Answer: (B)

This test targets the acromioclavicular (AC) joint by stressing it through horizontal adduction of the arm. With the patient seated, the arm is placed in about 90 degrees of forward flexion and then brought across the chest toward the opposite shoulder. Applying pressure across the AC joint during this motion compresses the joint and its capsule. If pain is elicited specifically at the AC joint during the maneuver, it suggests AC joint pathology such as sprain or osteoarthritis. This is distinct from tests like those for thoracic outlet or vascular issues, which rely on different postures and provoke symptoms unrelated to the AC joint.