Girl with left‐sided hip pain and fever

A previously healthy 13-year-old girl presented to the pediatric emergency department (PED) with 5 days of progressively worsening left-sided hip pain and 4 days of fever. Although she was able to bear weight on the left leg, she walked with a limp. There was no preceding trauma or illness. In the PED, she was febrile to 39.5°C and tachycardic with other vital signs appropriate for her age. On examination, she had full range of motion of the...