Merck Manual

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Holding the Knee Together
Holding the Knee Together

    Two ligaments, one on either side of the knee, prevent the knee from moving from side to side too much:

    Two ligaments inside the joint (cruciate ligaments) prevent the knee from moving forward or backward too much:

    The ACL crosses in front of the PCL, forming an X.

    The menisci are pads of cartilage that act as cushions between the thighbone (femur) and larger lower leg bone (tibia), which form part of the knee joint.