Posterior cruciate ligament avulsion fracture

Posterior cruciate ligament (PCL) avulsion fractures are a type of avulsion fracture of the knee that represent the most common isolated PCL lesion. This typically involves separation of the posterior tibial insertion of the PCL to variable degrees.

These injuries are commonly seen in motorcycle or car accidents (dashboard injuries) in which posteriorization forces occur against the tibia in a flexed knee.

Avulsion at its tibial insertion is the most common PCL isolated lesion (~50%) 1.

  • type I: non-displaced 2
  • type II: upward displacement of the posterior aspect of the avulsed tibial bone fragment 2
  • type III: totally displaced avulsed bone fragment 2

It can be identified as a bone discontinuity at the posterior tibial articular surface (lateral radiograph view). On MRI or CT imaging, a fractured bone fragment can be noted attached to a retracted/redundant PCL ligament.

Surgical reinsertion of the avulsed fragment is the standard treatment.

Knee pathology

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

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Article information

rID: 43789
Tag: refs
Synonyms or Alternate Spellings:
  • PCL avulsion fracture

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