What ligament is stressed during the Yergason's and Speed's Tests?

The correct answer is the Transverse Humeral Ligament. This ligament plays a key role in stabilizing the biceps tendon within the bicipital groove of the humerus. During the Yergason's and Speed's Tests, which are specifically designed to assess the integrity of the biceps tendon and its associated structures, the physician or examiner applies resistance to movements that engage the biceps muscle.

In the Yergason's Test, the forearm is supinated, and resistance is applied while attempting to flex the elbow, thereby placing tension on the biceps tendon. If the transverse humeral ligament is compromised, the biceps tendon may dislocate from its normal position. Similarly, in the Speed's Test, resistance is applied while the arm is elevated in front of the body, again testing the stability of the biceps tendon and its attachment, which is significantly influenced by the transverse humeral ligament.

Understanding this relationship is crucial, as it highlights the importance of the transverse humeral ligament in both tests, focusing on how the ligament's integrity directly impacts the assessment of the biceps tendon function in the shoulder joint.