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ACL tears are some of the most common knee injuries athletes and active people suffer. It is a devastating injury, as it often means surgery, months out of sports and exercise, and a long rehab process.

Please note: I don't respond to questions and requests for specific medical advice left in the comments to my videos. I receive too many to keep up (several hundred per week), and legally I can't offer specific medical advice to people who aren't my patients (see below). If you want to ask a question about a specific injury you have, leave it in the comments below, and I might answer it in an upcoming Ask Dr. Geier video. If you need more detailed information on your injury, go to my Resources page: https://www.drdavidgeier.com/resources/

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The anterior cruciate ligament serves to stabilize the knee. If you tear your ACL, you could have an unstable knee that gives way when you land from a jump or plant your foot to change directions. That is one of the main reasons athletes undergo surgery. With an unstable knee, they cannot perform the motions they need to do to be able to play.

In this video, I explain the common mechanisms of injury. How do you tear your ACL? What is the process for evaluating the injury to find out that you did tear your ACL? I know this injury is scary, but I can help you understand it a little bit better.

Please remember, while I appreciate your questions, I cannot and will not offer specific medical advice by email, online, on my show, or in the comments at the end of these posts. My responses are meant to provide general medical information and education. Please consult your physician or health care provider for your specific medical concerns.