The knee joint is a synovial hinge joint. Articulation is between the femur (specifically the femoral condyles and tibial condyles. The patella, also part of the joint, articulates with the front of the femur. The knee joint allows flexion and extension and a small amount of rotation.
Between the articular surfaces of the femur and tibia are two C-shaped cartilages, the medial meniscus and the lateral meniscus.