Proximal fibular fracture (arcuate sign)
Trauma to the left aspect of the knee. Then developed pain and difficulty walking.
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Small avulsion fracture of the styloid process of the proximal fibula, with a defect in the fibular head noted. The lateral aspect of the fibular head shows a cortical discontinuity and small transverse fracture line.
The avulsed triangular-shaped fracture fragment in this case demonstrates the arcuate sign which indicates arcuate ligament-complex injury. The small transverse fracture line seen at the lateral aspect of fibular head raises suspicion for fibular collateral ligament incompetence.