In MMT for scapular abduction in anti-gravity, what is the test position?

In MMT for scapular abduction in anti-gravity, what is the test position?

• A. Supine with shoulder flexed to 90 and elbow extended
• B. Prone with the arm abducted 90
• C. Seated with the arm at the side
• D. Standing with the arm overhead

Answer: (A)

Scapular abduction against gravity mainly tests the serratus anterior as it protracts the scapula. The most appropriate test position is supine with the shoulder flexed to 90 degrees and the elbow extended because this setup requires the scapula to move forward (protraction) to allow the arm to reach that forward, elevated position. Gravity then provides the anti-gravity challenge, so the tester can evaluate how well the serratus anterior holds the scapula in protraction while the arm is elevated. In this position, the movement is focused on the scapular protractor rather than on pure shoulder elevation or other motions, helping isolate the muscle being tested. The other positions don’t isolate scapular abduction as cleanly: a prone position with the arm abducted 90 degrees shifts emphasis toward shoulder abduction and different stabilizers; seated with the arm at the side offers little or no protraction against gravity; standing with the arm overhead alters the mechanics and recruiting pattern, making it harder to specifically assess the scapular protractor. So the supine position with 90-degree flexion and elbow extended best isolates and challenges the serratus anterior during scapular abduction against gravity.

Scapular abduction against gravity mainly tests the serratus anterior as it protracts the scapula. The most appropriate test position is supine with the shoulder flexed to 90 degrees and the elbow extended because this setup requires the scapula to move forward (protraction) to allow the arm to reach that forward, elevated position. Gravity then provides the anti-gravity challenge, so the tester can evaluate how well the serratus anterior holds the scapula in protraction while the arm is elevated.

In this position, the movement is focused on the scapular protractor rather than on pure shoulder elevation or other motions, helping isolate the muscle being tested. The other positions don’t isolate scapular abduction as cleanly: a prone position with the arm abducted 90 degrees shifts emphasis toward shoulder abduction and different stabilizers; seated with the arm at the side offers little or no protraction against gravity; standing with the arm overhead alters the mechanics and recruiting pattern, making it harder to specifically assess the scapular protractor.

So the supine position with 90-degree flexion and elbow extended best isolates and challenges the serratus anterior during scapular abduction against gravity.