This is due to bleeding into the knee joint from torn blood vessels in the damaged ligament. The instability caused by the torn ligament leads to a feeling of buckling and giving way of the knee, especially when trying to change direction on the knee. The knee may feel like it wants to slip backwards. read more
A Patient's Guide to Anterior Cruciate Ligament Injuries (ACL Injuries) Introduction: The anterior cruciate ligament (ACL) is probably the most commonly injured ligament of the knee. In most cases, the ligament is injured by people participating in athletic activity. read more
How to Confirm a Partial ACL Tear. It can be hard to determine whether or not your ACL is partially torn, particularly because a partial tear keeps your ACL from presenting normal signs of being torn, like your knee 'buckling'. read more
You may have: Pain, often sudden and severe; A loud pop or snap during the injury; Swelling within the first 24 hours after the injury; A feeling of looseness in the joint; Inability to put weight on the joint without pain, or any weight at all; These injuries need medical attention. read more