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Figure 22. Sagittal T2 weighted water excitation sequences through the (a) lateral and (b) medial compartments of the knee. There are small osteophytes shown in the lateral compartment on the anterior and posterior aspects of the tibia. Note also the articular cartilage which is well shown with this sequence over the femoral and tibial articular surfaces. In the medial compartment there is full thickness cartilage loss over the weight bearing portions of the femur and tibia with the exception of a small area of residual cartilage under the posterior horn of the meniscus (arrowhead). Marrow oedema is seen in the subchondral bone at the sites where it is denuded of cartilage.
