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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