It is able to achieve a wide range of motion through a combination of gliding, bending and rotating movements. As a result, it is also the most frequently injured joint in the body. The femur and the tibia act as long levers that, when combined with the force of the body's weight, put a significant amount of stress on the joint. In addition, the stresses experienced during sudden starts, stops and cutting movements make this joint susceptible to injury. One of the most common injuries that can occur during athletics is a knee sprain, or tearing of a ligament.
Ligaments are fibrous cords that connect the bones and stabilize the joint.
There are four major ligaments in the knee. Sprains can vary from just a minor stretch of a ligament to a complete disruption. Since ligaments play such a key role in stabilizing the joint, a serious sprain can lead to significant pain and instability. When the injury occurs, it can be accompanied by a popping sound or tearing sensation. In minor sprains, the injury is treated with an activity restriction, and possibly with bracing or physical therapy.