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The bones of the knee and the leg include the femur, which is the large thigh bone; the tibia and fibula, which are the leg bones between the knee and ankle; and the patella, which is sometimes called the kneecap.
The knee is a pivot-like hinge joint in the leg that connects the bones in the upper and lower leg. It is the largest joint in the human body. The knee is where the femur in the upper leg meets with the tibia and fibula bones in the lower leg. Another bone, the patella or kneecap, is at the center of the knee.