Figure 2. Proton density–weighted magnetic resonance imaging (MRI) appearance of
normal anterolateral ligament (ALL) and related lateral structures. (A)
Axial sequence demonstrating the inferior lateral genicular arteries
(arrow), the ALL (arrowhead), the fibular collateral ligament (notched
arrow), and the biceps femoris (pentagon arrow). (B) On a coronal MRI
sequence, the ALL is identified (arrow). (C) Axial and (D) coronal
sequences identifying the proximal Kaplan fibers (arrows) extending from
the femur to the iliotibial band.