Types of ACL Injuries An anterior cruciate ligament (ACL) injury
often is called a sprain. A sprain occurs when the threads or
fibers of the ligament stretch or are torn. Most ACL injuries
occur in the middle of the ligament. See an illustration of the
knee and the ACL. An ACL injury is classified as a grade I, II,
or III sprain. Grade I sprain Grade II sprain Grade III sprain
An ACL avulsion occurs when the ACL is torn away from either the
upper leg bone or lower leg bone. This type of injury is more
common in children than adults. An avulsion fracture occurs when
the ACL is torn away from the leg bone with a piece of the bone.
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