Emphysematous septic arthritis due to Klebsiella pneumoniae.

A 60-year-old woman with rheumatoid arthritis developed acute emphysematous septic arthritis of the knee due to Klebsiella pneumoniae. She was brought to the hospital in septic shock with disseminated intravascular coagulation and had striking physical signs and roentgenograms showing distention of the knee with gas. She also had an infection of the hand with subcutaneous gas. After surgical drainage and institution of antibiotic therapy, she remained critically ill for several days but gradually improved. Two months later, she was ambulating independently. Emphysematous septic arthritis is rare. Four cases have previously been reported, but none were caused by Klebsiella.