Positive PCL line sign

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 medullary cavity of the distal femur, if it does not, it would be suggestive of ACL tear. 

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Article information

rID: 38876
Section: Signs
Synonyms or Alternate Spellings:
  • PCL line sign
  • Positive PCL line sign

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