what is a ligament injury
An ACL injury -- or other ligament injury -- is sometimes hard to diagnose. Symptoms of a knee ligament injury are: 1  Pain, often sudden and severe. 2  A loud pop or snap during the injury. 3  Swelling. 4  A feeling of looseness in the joint. 5  Inability to put weight on the point without pain. 6  1.7  2.n ACL injury -- or other ligament injury -- is sometimes hard to diagnose. Symptoms of a knee ligament injury are: 1  Pain, often sudden and severe. 2  A loud pop or snap during the injury. 3  Swelling. 4  A feeling of looseness in the joint. 5  Inability to put weight on the point without pain. 6  1.