During MMT for internal rotation in anti-gravity, what stabilization is used?

During MMT for internal rotation in anti-gravity, what stabilization is used?

• A. Clinician stabilizes the ipsilateral shoulder.
• B. The weight of the trunk on the table stabilizes.
• C. Stabilization by the opposite shoulder.
• D. No stabilization.

Answer: (A)

Stabilizing the same-side (ipsilateral) shoulder fixes the proximal segment of the limb so the movement tested comes from the internal rotators at the glenohumeral joint, not from the trunk or shoulder girdle. In anti-gravity testing, gravity tends to drive the arm into internal rotation, so the clinician’s stabilization of the ipsilateral shoulder prevents scapular or trunk compensations and keeps the test isolated to the internal rotators. Relying on trunk weight or the opposite shoulder can allow unwanted movement or substitutions, making the test less valid. No stabilization would lead to uncontrolled movement and an unreliable result.

Stabilizing the same-side (ipsilateral) shoulder fixes the proximal segment of the limb so the movement tested comes from the internal rotators at the glenohumeral joint, not from the trunk or shoulder girdle. In anti-gravity testing, gravity tends to drive the arm into internal rotation, so the clinician’s stabilization of the ipsilateral shoulder prevents scapular or trunk compensations and keeps the test isolated to the internal rotators. Relying on trunk weight or the opposite shoulder can allow unwanted movement or substitutions, making the test less valid. No stabilization would lead to uncontrolled movement and an unreliable result.