ABSTRACT
We report a case of delayed diagnosis of osteomyelitis of the scapula extending to glenoid, with secondary septic arthritis of glenohumeral joint in a 6-month-old female infant. We performed urgent arthrotomy of the shoulder joint through an anterior approach with drainage of pus from the scapula through a posterior approach and prescribed intravenous antibiotics. Diagnosis was delayed as the patient initially presented with pneumonia, for which she was treated in the neonatal intensive care unit; at that time, all medical efforts were directed toward saving her life. Had the diagnosis been made earlier, septic arthritis of the shoulder might have been prevented. Diagnosis of septic shoulder arthritis is rare and difficult, requiring a high index of suspicion.