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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 ends of the three bones in the knee joint are covered with articular cartilage, a tough, elastic material that helps absorb shock and allows the knee joint to move smoothly. Separating the bones of the knee are pads of connective tissue called menisci (men-NISS-sky). The menisci are two crescent-shaped discs, each called a meniscus (men-NISS-kus), positioned between the tibia and femur on the outer and inner sides of each knee.