Knee posterolateral corner injuries magnetic resonance imaging (MRI)

MRI of the posterolateral corner. (G-I) Posterolateral corner (PLC) injuries.

(G) Coronal short time inversion recovery (STIR) MR image demonstrates tears of the PFL (arrow) and FCL (arrowhead).

(H) Sagittal T2-weighted fat-saturated MR image in another patient demonstrates a tear of the PFL (arrow).

(I) The "arcuate sign" is demonstrated on the coronal STIR MR image that shows an avulsion fracture (arrow) of the lateral aspect of the head of the fibula at the insertion of the conjoined tendon of the FCL and BT (arrowhead).