1 Day Of High in Pediatrics — Case | Pediatric Infectious | SMLE Q#761
SMLE Question #761
Pediatrics
Pediatric Infectious
Objective: OBJ-113
Last updated: February 2026
A 5-month-old boy is brought to the emergency department with 1 day of high fever and refusal to move his left leg. He cries when his parents change his diaper. Examination shows a markedly swollen, warm, erythematous left knee with an effusion and severe pain with passive movement; he holds the knee flexed and resists extension. What is the most likely diagnosis?
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