Septic arthritis and bursitis: emergency ultrasound can facilitate diagnosis.

This article reports the case of a 52-year-old woman with septic arthritis and bursitis of her shoulder. Due to a minor musculoskeletal injury and lack of fever, the diagnosis was missed on her first Emergency Department visit. Sonographic guidance of the shoulder arthrocentesis led to successful aspiration of the larger fluid collection in the subacromial bursa and allowed the diagnosis and treatment to proceed more rapidly. Septic arthritis is a challenging clinical diagnosis, and when it occurs in more difficult to aspirate joints, the diagnosis can become more challenging still. Ultrasound provides a means for the emergency physician to establish the diagnosis more readily.