Positive PCL line sign

Last revised by Dr Henry Knipe on 05 Aug 2018

The positive PCL line sign is an indirect sign of anterior cruciate ligament (ACL) tear based on secondary changes of the posterior cruciate ligament (PCL) on MRI images. A line tangent to the upper border of the PCL should normally intersect the medullary cavity of the distal femur, if it does not, it is suggestive of an ACL tear. 

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