Knee joint and related structures

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Compound synovial of the condylar and sellar variety between condyles of femur and tibia and posterior surface of patella.

Articular surfaces:

The articular surfaces of the joint are far from being congruent and the joint would be very unstable were it not for the support provided by the ligaments, tendons and muscles around it. The femoral condyles are convex from side to side and from before backwards. The lateral condyle flattens from before backwards more rapidly than the medial one. The tibial condyles are flat and are separated form each other by the intercondylar area.