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Review Question - QID 7194

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QID 7194 (Type "7194" in App Search)
A 2-year-old child refused to walk 3 days prior to being seen because of pain in the left hip. The pain has gradually subsided and the child is now walking. He is afebrile and has full motion of the hips. Laboratory studies show a normal CBC with differential and C-reactive protein. An ultrasound shows a joint effusion in the left hip. What is the most likely diagnosis?