Presentation
Inability to weight bear following collision with cycle.
Patient Data
Age: 20 years
Gender: Male
From the case:
Segond fracture
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Frontal

Avulsed bone fragment from the lateral margin of the tibial plateau. Features are of a segond fracture which is a harbinger for significant internal knee damage.
Case Discussion
The patient suffered a segond fracture. Further evaluation demonstrated a partial ACL tear.
This is different to the arcuate sign, which is a fracture of the proximal tip of the fibula.