What anatomic structures articulate to form the knee joint?

The knee joint is primarily formed by the articulation of the condyles of the femur with the tibial plateaus. The femur, being the thigh bone, has two rounded ends known as condyles that rest on the flat surfaces of the tibia, which is the larger bone in the lower leg. This specific alignment creates a stable joint that allows for a range of movements, including flexion and extension, which are essential for activities such as walking, running, and jumping.

The tibial plateaus are crucial because they provide the necessary surface area for weight distribution and stability during movement. The relationship between these structures is vital in the biomechanics of the knee, making their articulation the correct answer in this context. Other potential combinations, such as involving the fibula or patella, do not represent the primary articulation that allows for the knee joint's main functions. The fibula does not bear weight in the way the tibia does and serves mainly as a support structure, and while the patella provides protection to the knee joint and aids in movement, it does not form the primary articulation with the femur on its own. Thus, the articulation of the femoral condyles with the tibial plateaus is the key to understanding the knee's