In the compression rotation test, how is the arm positioned?

In the compression rotation test, positioning the arm at 90 degrees is critical for effectively assessing potential shoulder pathologies, specifically relating to the glenohumeral joint. When the arm is abducted to 90 degrees, it allows for optimal access to the joint structures being evaluated. This position facilitates the application of compressive forces while allowing for a rotational component, which can help provoke symptoms associated with conditions like labral tears or rotator cuff injuries.

When the arm is at 90 degrees, the biomechanics of the shoulder joint are engaged in a way that maximizes the tension in the soft tissues around the joint. Additionally, this position enables a clearer evaluation of pain provocation, which is essential for diagnosing specific shoulder injuries or conditions based on the clinical indications during the test.

Thus, the 90-degree arm positioning is standard for this test, making it the appropriate option for accurately assessing underlying shoulder issues.