During elbow extension testing in anti-gravity, which structure is stabilized by the clinician?

During elbow extension testing in anti-gravity, which structure is stabilized by the clinician?

• A. The humerus
• B. The forearm
• C. The scapula
• D. The testing surface

Answer: (A)

When testing elbow extension against gravity, the goal is to isolate the elbow joint so the exertion comes from the elbow extensor muscles (primarily the triceps) without compensations from the shoulder or trunk. Stabilizing the proximal arm fixes the humerus, which locks the shoulder girdle in place and prevents substitutions through shoulder or scapular movement. If you tried to stabilize the forearm, you would block the very segment that needs to move during elbow extension; stabilizing the scapula or the testing surface wouldn’t reliably prevent shoulder-driven compensation. So, the clinician stabilizes the humerus.

When testing elbow extension against gravity, the goal is to isolate the elbow joint so the exertion comes from the elbow extensor muscles (primarily the triceps) without compensations from the shoulder or trunk. Stabilizing the proximal arm fixes the humerus, which locks the shoulder girdle in place and prevents substitutions through shoulder or scapular movement. If you tried to stabilize the forearm, you would block the very segment that needs to move during elbow extension; stabilizing the scapula or the testing surface wouldn’t reliably prevent shoulder-driven compensation. So, the clinician stabilizes the humerus.