A meniscus tear is a common knee joint injury. The most common causes of
meniscus tears are sports-related movements, often when the knee is twisted while the
knee is partially flexed and the foot is firmly planted on the ground. Men are
more than twice as likely to have a meniscus tear than women.
Meniscus tears also are common with normal movement in older people
whose menisci are worn down.
Meniscus tears often occur along with tears of the
anterior cruciate ligament (ACL).
Knee pain is incredibly common. In the United States, it's responsible for about 1/3 of all doctor's visits for muscle and bone pain. Knee pain is a special problem for athletes -- over half of all athletes endure it every year.
Some of the most common reasons for knee pain are swollen or torn ligaments, meniscus (cartilage) tears, and runner's knee. But the knee is a complex joint, and there's plenty more that can go wrong.
Other conditions that cause knee pain include: