A 13-year-old boy is brought to the emergency department with six weeks of ache in the left knee, worse after…

Question

A 13-year-old boy is brought to the emergency department with six weeks of ache in the left knee, worse after football and now making him limp. There has been no injury, no fever and no swelling of the knee. His weight is above the 97th centile for age. The knee looks normal and moves fully without tenderness. When the left hip is passively flexed, the thigh rolls outwards. Which one of the following investigations is most likely to establish the cause of his limp?

Accepted Answer

Frog-leg lateral radiograph of the pelvis

Answer

Blood cultures and inflammatory markers

Answer

Magnetic resonance imaging of the knee

Answer

Radiograph of the left knee

Answer

Ultrasound of the left hip

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