Proximal fibular fracture (arcuate sign)

Case contributed by Dr Haytham Mohamed


Trauma to the left aspect of the knee. Then developed pain and difficulty walking.

Patient Data

Age: 20 years
Gender: Male

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.

Case Discussion

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.

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Case information

rID: 56857
Published: 29th Nov 2017
Last edited: 29th Nov 2017
Inclusion in quiz mode: Included
Institution: Ibn Al-Haitham Medical center

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