What is the ACL?

Anterior Cruciate Ligament (ACL) is one of the four ligaments in the knee joint (orthoinfo2017)

The ACL runs diagonally inside the knee like a rope to make the joint stable. The ACL keeps the knee stable when changing directions quickly or when landing from a jump.

HOW IS THE LIGAMENT INJURED?

Changing direction with the knee caving in

Planting and twisting your foot

Stopping suddenly

Poor landing technique from a jump

Being hit on the knee from the front or the side