Figure 1.

A 56-year-old woman presenting with left knee pain after a fall. (a) Initial anteroposterior radiograph was considered normal, however, subtle cortical disruption of the anterior rim of the medial tibial plateau, medial to the tibial spine, is noted (arrow). (b) Coronal T1-weighted MRI confirms the cortical disruption (arrow) and shows extensive fracture through the proximal tibia. (c) Coronal proton density-weighted image with fat saturation shows extensive edema in the subchondral bone. Note also hypersignal adjacent to the medial collateral ligament corresponding to a grade I sprain (arrowheads).