Escherichia coli septic arthritis of a shoulder in a diabetic patient.

Escherichia coli septic arthritis is rare and usually occurs in patients with underlying systemic disorders. Most commonly the hip joint is involved and the E. coli septic arthritis is caused by an intraabdominal source (e.g., an abscess communicating with the hip joint). We report the first case of E. coli septic arthritis involving the shoulder joint in a diabetic patient.