Presentation
1 month post twisting knee injury
Patient Data
Age: 35 years
Gender: Male
From the case:
Lateral sulcus sign
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Frontal

Small joint effusion. Alignment is normal. The lateral projection demonstrates a deep sulcus terminalis of the lateral femoral condyle (deep lateral femoral notch sign).
Case Discussion
The patient went on to have a MRI which showed an ACL rupture.