A 70 year old lady presents to your ED with a painful left knee. She has had three days of pain and swelling with intermittent fevers. On examination the knee is hot, red and swollen with a limited range of motion. She is apyrexial. She has severe difficulty weight bearing.

She has a history of recurrent UTI’s and is on prophylactic antibiotics.

You perform an aspirate of her knee which shows: Continue reading →