A tooth (plural teeth) is a small, calcified, whitish structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores, also use teeth for hunting or for defensive purposes. The roots of teeth are covered by gums.
Symptoms can include: 1  A popping sound (or a popping or snapping feeling) at the time of injury can sometimes be heard (or felt) if a ligament is completely torn. 2  Swelling of your knee. 3  Pain in your knee.  Tenderness around your knee on 1  touching. Not being able to use or move your knee normally.
These injuries are common in soccer players, football players, basketball players, skiers, gymnasts, and other athletes. There are four ligaments in the knee that are prone to injury: 1  Mentioned above, the anterior cruciate ligament (ACL) is one of the two major ligaments in the knee.2  It connects the thigh bone to the shin bone in the knee. 3  ACL injuries are a common cause of disability in the knee.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.