What are signs and symptoms of an ACL injury?
Many anterior cruciate ligament (ACL) injuries happen while playing sports, but not necessarily from a hard collision. In fact, most ACL injuries are what we call “non-contact,” meaning they occur during a sudden change in direction, not when struck by another player.
Athletes who have suffered an ACL injury typically experience rapid swelling of the knee within 24 hours of the injury. Some may be able to walk after the injury, or even continue to play their sport. Many people report that they hear or feel a “pop” in their knee when the injury occurs. As the swelling subsides over the following days or weeks, most people notice that their knee feels unstable or “gives out.”