A contact injury occurs when another object or person hits the knee, causing the ACL injury. A non-contact injury, which occurs in roughly 70% of ACL injuries (Boden et al. 2001; McNair, Marshall, and Matheson, 1990), occurs when an object does not directly contact the knee. Non-contact injuries are usually caused by turning the knee, causing the femur and tibia to twist in opposite directions, which results in the ACL being stretched/torn. There are several causes of ACL injuries, many of which are not listed here. These are just a few different ways an ACL injury can occur:
What are some signs you have a torn/injured ACL?
Sources: https://www.nlm.nih.gov/medlineplus/ency/article/001074.htm , http://pediatrics.aappublications.org/content/133/5/e1437#xref-ref-29-1 |