What distinguishes the Biceps Load Test I from Biceps Load Test II?

The distinguishing feature between Biceps Load Test I and Biceps Load Test II is indeed the angle of shoulder abduction.

In Biceps Load Test I, the shoulder is positioned at 90 degrees of abduction, while in Biceps Load Test II, the shoulder is positioned at 120 degrees of abduction. This variation in degrees affects the tension in the biceps tendon and the structures surrounding the shoulder, specifically the labrum. The purpose of these tests is to assess the integrity of the biceps tendon and its association with the labrum, particularly in cases of SLAP (Superior Labrum Anterior to Posterior) lesions.

By changing the abduction angle, practitioners can create different biomechanical loads on the biceps tendon and surrounding soft tissues, helping to differentiate between potential pathologies. This procedural variation is essential for accurate assessment and diagnosis in patients with shoulder complaints.