Anterior cruciate ligament lies in the knee's middle. It prevents the tibia sliding, and provides knee's rotational stability.
Anterior cruciate ligament is prone to injuries. The following sports often cause cruciate ligament injuries: football, basketball and skiing. If the knee joint is over-extended, cruciate ligament may also be injured. The cruciate ligament injuries often have the following symptoms: knee pain, knee swelling, unstable knee.
Anterior cruciate ligament injuries, if left untreated, may lead to early arthritis. If the injury is mild, it may heal automatically, but if the injury is severe, do not try to move the knee joint - seek prompt medical help, and a surgery may be needed.