Septic arthritis Quiz: Ace Your Exams

Get ready to dominate your medical and nursing exams by using our dynamic quizzes to elevate your knowledge and increase your confidence. Whether you're gearing up for the USMLE®, COMLEX®, or your next in-class assessment, Osmosis quizzes tackle key topics in pathology, diagnostics, and treatment approaches. By honing in on clinical readiness and decision-making, we make sure the knowledge you gain empowers you both in the classroom and in real-world practice. Jump in and supercharge your exam prep!

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A 73-year-old man presents to the emergency department for evaluation of right knee pain and swelling for the past 2 days.  The patient has been unable to ambulate secondary to the pain. Past medical history includes hypertension, gout, diabetes, osteoarthritis, and obesity. Temperature is 38°C (100.4°F), blood pressure is 125/71 mmHg, pulse is 98/min, respiratory rate is 14/min, and oxygen saturation is 99% on room air. On physical examination, there is a palpable effusion, warmth, and marked swelling of the right knee. The patient is unable to bear weight without significant pain. An arthrocentesis is performed. The synovial fluid analysis results from later that day are shown below. Which of the following is the most likely diagnosis?  

Laboratory value   
Result
Reference Range
Color
Opaque/Cloudy
Clear yellow
Culture/Gram stain
Moderate polymorphonuclear cells on Gram stain;  No growth on culture thus far
Negative/No growth
Cell Count
77,532 cells/microL, 95% polymorphonuclear leukocytes
<2,000 cells/microL; <25% polymorphonuclear leukocytes
Crystal Analysis
Negative
Negative

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