A 6-year-old boy is brought to the Emergency Department with a 2-day history of a limp. On examination, he looks well, has a temperature of 38 °C and is able to weight-bear. His hip examination reveals mild decreased range of motion. Radiographs of his hip and pelvis show no abnormality. His C-reactive protein level is 8 mg/L (< 6). Which one of the following is the most likely diagnosis?
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