For internal rotation in gravity-minimized testing, what is the test position?

For internal rotation in gravity-minimized testing, what is the test position?

• A. Prone with shoulder and elbow extended off the edge of the table; head rotated to same side.
• B. Prone with shoulder abducted 90 degrees and elbow flexed.
• C. Seated with the arm at 90 degrees of abduction.
• D. Supine with arm by the side and forearm in neutral.

Answer: (A)

Gravity-minimized testing aims to isolate a muscle group by removing the influence of weight. For internal rotation, you want the arm positioned so the limb’s weight doesn’t drive or hinder the rotation, so any effort observed reflects the internal rotators rather than gravity or other movements. The best setup is having the patient prone with the shoulder and elbow extended off the edge of the table, so the arm hangs unsupported. In this position, gravity isn’t creating a clear rotational torque about the glenohumeral joint, allowing the internal rotators (like the subscapularis) to demonstrate their capacity without gravitational assistance. Turning the head to the same side helps stabilize the trunk and scapula, reducing compensatory motions. Other positions tend to let gravity influence the movement or recruit additional muscles, which muddies the isolation of the internal rotators. So this prone-with-arm off the table setup provides the cleanest assessment in a gravity-eliminated context.

Gravity-minimized testing aims to isolate a muscle group by removing the influence of weight. For internal rotation, you want the arm positioned so the limb’s weight doesn’t drive or hinder the rotation, so any effort observed reflects the internal rotators rather than gravity or other movements.

The best setup is having the patient prone with the shoulder and elbow extended off the edge of the table, so the arm hangs unsupported. In this position, gravity isn’t creating a clear rotational torque about the glenohumeral joint, allowing the internal rotators (like the subscapularis) to demonstrate their capacity without gravitational assistance. Turning the head to the same side helps stabilize the trunk and scapula, reducing compensatory motions.

Other positions tend to let gravity influence the movement or recruit additional muscles, which muddies the isolation of the internal rotators. So this prone-with-arm off the table setup provides the cleanest assessment in a gravity-eliminated context.