Extra-Articular Abscess Expansion as a Specific Complication of Septic Arthritis of the Shoulder Joint: Report of Three Cases with Extension of the Infection through the Biceps Groove Producing a Large Abscess.

Rarely, septic arthritis of the shoulder joint can extend to the upper arm through the biceps tendon groove and cause an abscess. Also, acute osteomyelitis of the tuberosity should be considered in patients with long-standing refractory septic arthritis of the shoulder joint who have continued pain and uncontrolled laboratory findings after initial treatment.