Glenohumeral joint septic arthritis and osteomyelitis caused by <i>Moraxella catarrhalis</i> after arthroscopic rotator cuff repair: case report and literature review

<i>Moraxella catarrhalis</i> commonly colonizes the upper respiratory tract of humans, but infection caused by <i>M. catarrhalis</i> after orthopedic surgery is rare. Here, we report the first case of septic arthritis of the shoulder caused by an <i>M. catarrhalis</i> infection and outline the diagnosis and treatment steps as well as differences compared with other cases.