Posterolateral ligamentous complex

Last revised by Dr Joachim Feger on 07 May 2021

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

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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Cases and figures

  • Figure 1: posterior knee anatomy
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