Rheumatology Question 39

A 62 year old man present to clinic with a two day history of a painful swollen, warm left knee. You perform a diagnostic arthrocentesis and remove 20cc of cloudy fluid. The WBC count from the aspirate is 42,000/mm3.

What 3 characteristics of the synovial fluid will help you assess whether it is inflammatory at the bedside?

What is your differential diagnosis for a WBC count of 42,000/mm3?

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