A subacromial-subdeltoid bursa injection typically consists of the administration of a local anesthetic and a steroid medication, which can help reduce inflammation and pain in the shoulder joint. The procedure is often used to treat conditions such as shoulder impingement syndrome, rotator cuff tendonitis, and subacromial-subdeltoid bursitis. The medication is delivered into the bursa located between the rotator cuff and the acromion bone of the shoulder blade. The bursa is a small fluid-filled sac that provides cushioning and reduces friction between the rotator cuff and the acromion during shoulder movement. The needle used for the injection is placed into the bursa with the use of ultrasound guiding technology. The procedure is typically performed on an outpatient basis and takes only a few minutes to complete.