"Posterosuperior impingement, also known as internal impingement, is a relatively uncommon form of shoulder impingement primarily involving the infraspinatus tendon and the posterosuperior glenoid labrum. It occurs when the shoulder is abducted and externally rotated (ABER position)."
"posterosuperior labral tear or fraying or type IIB SLAP tear"
"Bennett lesion"
"MRI/MR arthrography"
Expected headings
"Plain radiograph / CT"
"MRI/MR arthrography"
"An extreme abduction and external rotation (ABER) position results in repeated impingement of the infraspinatus tendon and the posterior portion of the supraspinatus tendon between the head of the humerus and the posterior superior rim of the glenoid. There is resulting tendon degeneration, reactive humeral head cysts, and glenoid labrum degeneration."