A 10-week-old female with fever and an inability to move her left leg.

Apreviously healthy 10-weekold female was admitted to our hospital with a fever and an inability to move her left leg. The mother also noted a decrease in the child’s breast-feeding in the 3 days prior to presentation. Although there was no history of major trauma, it was revealed that her brother had picked her up roughly by her leg 5 days before her admission. On initial physical examination, she had increased capillary refill and tachycardia with toxic appearance. Flexion-adduction and internal rotation posture, and warmth, tenderness, and limitation of movement of the left hip joint were detected. Her laboratory findings were as follows: white blood cell count of 11700/mm3, erythrocyte sedimentation rate of 87 mm/h, and C-reactive protein level of 86 mg/L. A 10-Week-Old Female with Fever and an Inability to Move Her Left Leg