The point at which two bones meet between the femur (thigh bone) and the tibia (shin): The knee joint is a modified hinge or junction that is capable of slight rotation in a bent position.

Each of these wedge-shaped crescents of knee joints have shock absorbers that resist impacts when running, jumping, etc.

Violent rotational movements of the thighs or legs while the knee joints are flexed; as in, football, soccer, skiing, or other sports, can severely damage the menisci or cartilage disks when they are squeezed between the bones of the knee joints.