Knee posterolateral corner anatomy magnetic resonance imaging (MRI)

MRI of the posterolateral corner. (A-F) Normal anatomy.

(A) Artist rendering of the posterior aspect of the knee demonstrates the semimembranosus tendon (SmT) and its distal arms including the oblique popliteal ligament (OPL) crossing over to the posterolateral aspect of the knee and merging its fibers with the arcuate ligament (AL). Note the medial and lateral bundles of the AL, fabellofibular ligament (FFL), fibular collateral ligament (FCL), biceps femoris tendon (BT), popliteofibular ligament (PFL), popliteus muscle (Pm), and medial collateral ligament (MCL).

(B) Coronal proton density-weighted MR image shows the AL with the media land lateral bundles.

(C) Coronal proton density-weighted MRI shows the FFL.

(D) Coronal proton density-weighted MRI demonstrates the conjoined tendon of the FCL and BT at the insertion in the lateral aspect of the head of the fibula (short arrow).

(E) Coronal T2-weighted MRI shows the PFL oriented perpendicular to the popliteus tendon (PT) (arrowhead).