Posterolateral corner injury of the knee

Dr Amir Rezaee et al.

Posterolateral corner injury of the knee can occur in isolation or with other internal derangements of the knee, particularly cruciate ligament injuries.

The importance of injuries to the posterolateral ligamentous complex lies in the possible long term joint instability and cruciate graft failure if these are not identified and treated.

These are thought to account for approximately 2% of acute ligamentous injuries of the knee 4. It is often seen in sports related injuries.

Trauma to the anteromedial tibia while in extension is a frequent cause of this type of injury by producing varus stress. Patients often present with symptoms due to associated cruciate ligament injury or peroneal nerve damage.

There is no consensus between authors and textbooks in what constitutes the posterolateral ligamentous complex. The four main structures are:

MRI

Components of the posterolateral corner that with some variability can be identified on MRI are:

  • biceps femoris tendon
  • fibular collateral ligament
  • popliteus tendon
  • popliteus musculotendinous complex including: 
    • popliteofibular ligament
    • fabellofibular ligament
    • arcuate ligament
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Article Information

rID: 38877
Section: Approach
Tag: rewrite
Synonyms or Alternate Spellings:
  • Posterolateral corner injury
  • PCI
  • Posterior corner injury

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