If I think my knees hyperextend will I have an ACL tear?

Just because you have hyperextension in your knees does not mean that you will tear your ACL. THe research shows that you are at a higher risk for sustaining an ACL tear than a person who does not have knee hyperextension. If you are concerned about your knee hyperextension, speak with your primary doctor or a physical therapist about exercises to help you improve strength and balance to protect your knee to try and reduce the risk of ACL tear.