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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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