A ligament is a short band of tough fibrous connective tissue composed mainly of long, stringy collagen molecules. Ligaments connect bones to other bones in and around joints. They do not connect muscles to bones; that is the function of tendons. Ligaments limit the amount of mobility of a joint, or prevent certain movements altogether.
What Causes Knee Ligament Injuries?
You can injure a ligament through a sharp change in direction, landing wrong from a jump, or the most common a blunt force hit to the knee, such as in football tackle. The incident usually needs to happen at speed. Muscle weakness or incoordination predispose you to a ligament sprain or tear.
What is a Meniscus Tear?
Injuries to the crescent-shaped cartilage pads between the two joints formed by the femur (the thigh bone) and the tibia (the shin bone). The meniscus acts as a smooth surface for the joint to move on.
The two menisci are easily injured by the force of rotating the knee while bearing weight. A partial or total tear of a meniscus may occur when a person quickly twists or rotates the upper leg while the foot stays still (for example, when dribbling a basketball around an opponent or turning to hit a tennis ball). If the tear is tiny, the meniscus stays connected to the front and back of the knee; if the tear is large, the meniscus may be left hanging by a thread of cartilage. The seriousness of a tear depends on its location and extent.