Posterolateral ligamentous complex

Dr Ian Bickle and A.Prof Frank Gaillard et al.

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  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
Anatomy: Lower limb
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Article information

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

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Cases and figures

  • Figure 1: posterior knee anatomy
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