Posterolateral ligamentous complex

The posterolateral ligamentous complex (also known as the arcuate ligamentous complex) of the knee is an important stabilizer and consists of a number of structures. Depending on the publication/definition more or less of the following structures are included 1-4:

Functional classification

Some authors group the structure comprising this ligamentous complex into the following functional groups:

Radiographic features


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
Anatomy: Lower limb

Anatomy: Lower limb

Article information

rID: 7988
Section: Anatomy
Synonyms or Alternate Spellings:
  • Posterolateral corner structures of the knee
  • Posterolateral ligamentous complex of the knee
  • Arcuate ligamentous complex of the knee

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Figure 1: posterior knee anatomy
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.