Which position is tested during the Apley's Scratch test for internal rotation?

The Apley's Scratch test is designed to assess the range of motion of the shoulder, particularly focusing on the internal and external rotation capabilities. Specifically, when analyzing the internal rotation of the shoulder, the position of the arm behind the back is tested. This position requires the individual to reach behind their back to touch or grasp the opposite scapula.

This action emphasizes the internal rotation of the shoulder as the individual must draw the arm upward and inward, engaging the relevant muscles and joints in this range of motion. Therefore, being in this behind-the-back position effectively evaluates the internal rotation functionality of the shoulder, making it the correct choice for this aspect of the test.

In contrast, the other positions listed do not specifically target the internal rotation, as they either assess external rotation or involve different shoulder movements that do not isolate the internal rotation action in the same way.