How to Handle a Three-Year-Old Child’s Swollen Knee with Effusion?

A three-year-and-seven-month-old child has a swollen left knee with effusion. The child is afraid to extend the leg straight. After cold compresses, the swelling and pain in the knee have reduced, but there is still pain at night and difficulty walking. The parents inquire whether an MRI is necessary and how to administer a sedative to the child. The doctor suggests a follow-up examination and considers an MRI, recommending phenobarbital as the sedative. At the same time, it is advised that the child rest, avoid excessive exercise, and stay warm to prevent catching a cold. Is there any regional trauma? Is the living environment damp? Wishing for an early recovery!
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