Question
A two-year-old child suddenly developed a high fever of 40.3 degrees Celsius three days ago. Blood tests confirmed a bacterial tonsillitis, but there was no sign of swelling. After three days of intravenous ceftriaxone and Yanhuning, the fever continued, and the child recently started having trouble walking, exhibiting a waddling gait. There were no issues when sitting or lying down and turning over. What could be the cause of this, and is it possible that an accidental sprain in the waist is causing the fever?