4. Trauma to the Outside of the Knee
ACL injuries occur when there is an impact or shock to the outside the knee while it is in the hyperextended position. Under normal circumstances, the ACL will allow the knee to hyperextend beyond the meeting of the tibia. In most cases, this movement is not an issue.
However, when the loaded joint comes under direct pressure from an impact on the outside of the joint, moving toward the inside, then the ACL may experience a tear – especially if the athlete suffers a twisting movement while their foot remains planted.
When an athlete receives an ACL tear due to trauma to the outside of the knee, it may also accompany other ligament problems as well. It’s not uncommon for athletes to tear the MCL, and damage the meniscus as a result of these types of injuries.
Depending on the extent of your injury, your doctor may advise you to take time to let the swelling subside before they make a diagnosis.