See a picture of the knee and the ACL.
An ACL injury is classified as a grade I, II, or 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.
Primary Medical Reviewer William H. Blahd, Jr., MD, FACEP - Emergency Medicine
Adam Husney, MD - Family Medicine
Kathleen Romito, MD - Family Medicine
Specialist Medical Reviewer Freddie H. Fu, MD - Orthopedic Surgery
Current as ofMarch 21, 2017
Current as of: March 21, 2017
To learn more about Healthwise, visit Healthwise.org.
© 1995-2017 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Donations to UW Health are managed by the University of Wisconsin Foundation, a publicly supported charitable organization under 501(c)(3) of the Internal Revenue Code.