Anterior cruciate ligament injuries are common in contact sports and those involving a sudden change of direction. Often an ACL injury will occur in combination with injury to other structures in the knee joint.

At the time of injury, symptoms of an anterior cruciate ligament sprain will include extreme pain in the knee. There is likely to be a lot of immediate swelling from bleeding within the joint which will feel warm. There may be an audible pop or crack at the time of injury and a feeling of instability.

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