What is the expected response when a patient contracts the biceps in Ludington's Test?

In Ludington's Test, the expected response when a patient contracts the biceps is an absence of tendon movement, particularly when assessing for a rupture of the long head of the biceps tendon. The test involves the patient clasping their hands behind their head and flexing their biceps, while the clinician observes for movement of the biceps tendon at the shoulder.

If the long head of the biceps tendon is intact, contraction of the muscle will cause the tendon to move visibly as it engages with the shoulder joint. However, if there is a rupture, there will be little to no movement of the tendon, confirming the injury. This lack of movement indicates that the tendon is not functioning properly, which is why the correct answer emphasizes expecting no observable motion of the tendon during contraction.

This clinical test is specific and helpful in diagnosing biceps tendon issues, primarily focusing on the integrity and position of the tendon during active muscle contraction.