In which of the following shoulder positions is the supraspinatus tendon best exposed to perform cross fiber frictions?

The correct position for best exposing the supraspinatus tendon to perform cross fiber frictions is when the shoulder is in extension, adduction, and internal rotation. In this position, the supraspinatus tendon becomes more prominent and accessible.

When the shoulder is in this orientation, the alignment of the humerus and the scapula allows for better palpation and access to the tendon, which is located at the superior aspect of the greater tubercle of the humerus. This exposure is crucial for effectively applying cross fiber frictions, as it enhances the therapist's ability to target the tendon directly, maximizing the therapeutic benefit.

In contrast, other positions may not facilitate as optimal exposure to the tendon. For instance, positions involving abduction can move the tendon away from the palpation site, and positions that maintain external rotation can similarly obscure direct access. Therefore, the alignment achieved through extension, adduction, and internal rotation is particularly effective for this technique.