Knee ligament reconstruction surgery. Surgeon stripping a ligament during surgery to reconstruct a patient's anterior cruciate ligament (ACL). The ACL is one of the four major ligaments that hold the knee joint together. It joins the femur (thigh bone) to the tibia (shin bone) and is commonly injured while playing sport. This ligament will act as the donor ligament and will be grafted onto the torn ACL to restore full function of the knee.
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