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ACL Sprain

An ACL sprain is a stretching or tearing injury to the anterior cruciate ligament in the knee joint.Three bones make up the knee joint: the femur (thigh bone), the tibia (shin bone), and the patella, which is the kneecap. These bones are kept in position by ligaments, strong cords of fibrous connective tissue that attach bone to bone. Two of the four main ligaments are the anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL), which together form an ‘X’ shape inside the knee joint. The ACL is attached to the bottom of the femur at the back of the knee. It then passes through the joint diagonally and is attached to the top of the tibia at the front of the knee. Its purpose is to keep the joint stable by limiting the rotation and forward movement of the tibia underneath the femur. It is consequently very strong but not very flexible. 

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