The labrum is a ring of cartilage that surrounds the shoulder socket, assisting to stabilize the joint. Tears or damage to the labrum can result in pain through a variety of shoulder actions, together with internal rotation. Magnetic resonance picture of Bennett lesion and corresponding arthroscopic photo viewing posteriorly from https://www.theorthopaedicandpainpractice.com/what-are-some-shoulder-pain-treatments/