Posterolateral ligamentous complex

The posterolateral ligamentous complex (also known as the arcuate ligamentous complex) of the knee is an important stabiliser 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  in 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
Lower limb anatomy
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Article information

rID: 7988
Section: Anatomy
Tags: knee, ligament
Synonyms or Alternate Spellings:
  • Posterolateral ligamentous complex of the knee
  • Arcuate ligamentous complex of the knee

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Cases and figures

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    Posterolateral li...
    Figure 1: posterior knee anatomy
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