Apley's scratch test assesses which aspect of shoulder function?

• A. IR/ER stiffness/weakness
• B. Capsular laxity
• C. Glenoid labrum integrity
• D. AC joint stability

Answer: (A)

This item is about shoulder range of motion, especially how well the arm can rotate internally and externally. The Apley scratch test has you move the hand behind the back to touch the scapula and also move the hand across the chest to touch the opposite shoulder. Limitations in reaching behind the back reflect reduced internal rotation (and adduction), while trouble reaching across the chest reflects limited external rotation (and sometimes abduction). Together these movements gauge the overall rotational ROM of the shoulder and the soft-tissue/muscular capacity around the joint. It isn’t a test of capsular laxity, glenoid labrum integrity, or AC joint stability, which are assessed with other specific maneuvers.