Positive PCL line sign

Dr Henry Knipe and Dr Amir Rezaee et al.

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. 

Knee pathology

The knee is a complex synovial joint that can be affected by a range of pathologies:

Article information

rID: 38876
Section: Signs
Tag: stub, cases, refs
Synonyms or Alternate Spellings:
  • PCL line sign
  • Positive PCL line sign

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