A 60-year-old man presents with acute onset of severe pain in his right knee, which started two days ago. | Medibuddy
30th April 2024

A 60-year-old man presents with acute onset of severe pain in his right knee, which started two days ago.

A 60-year-old man presents with acute onset of severe pain in his right knee, which started two days ago. He reports the knee is swollen, red, and warm to touch. He has a history of type 2 diabetes and a recent skin infection on his leg. He denies any recent trauma or insect bites. His temperature is 38.3°C, and he is unable to bear weight on the affected leg.

Investigations:

White Cell Count: Elevated

CRP: Elevated

Urea and Electrolytes: Normal

Liver Function Tests: Normal

Plain X-Ray of Knee: No bony abnormalities

Which is the most appropriate diagnostic investigation to confirm septic arthritis in this patient?

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