The tibial plateau is the flattened upper surface of the tibial bone (shinbone), where it makes contact with the rounded ends (condyles) of the femur (thighbone).

X-ray showing the upper end (plateau) of the tibia with its central tibial spines (where the anterior cruciate ligament attaches). It articulates with the femur above, but there is also a joint with the fibula at the outer side.
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FORUM DISCUSSIONS
Tibial Plateau Fracture - No Displacement.
Undiagnosed tibial plateau fracture from two months ago.
Tibial plateau fracture???? not that bad???
CLINICAL PUBLICATIONS
Recent progress in the diagnosis and treatment of posterior tibial plateau fractures. Chen H, Chang S,2 and Jun Pan3 Int J Clin Exp Med. 2015; 8(4): 5640–5648.