Shoulder sonosurgery is a term used to describe percutaneous procedures performed under ultrasound guidance. Within the shoulder, ultrasound is used to monitor the position of the needle as the drug is administered to specific joint structures. Most often it is the administration of a steroid block to the changed subacial bursitis and the injection of overloaded rotator cuff tendons with plasma. Under ultrasound guidance, a percutaneous procedure is also performed to remove calcification within the tendons of the rotator cuff muscles and joint puncture, i.e. collection of synovial fluid for diagnostic or therapeutic purposes.