During activities such as walking, running, sports practice, dance practice, or if one happens to stumble upon any object while walking, it may injure the knee. Also, if the injury is more severe, it may cause sliding of the bone located in the knee joint. It is one of the most common leg injuries and can be cured easily if the treatment is started in time and the due care is taken. A sprain can be defined as wrenching of the ankle, whereas strain can be defined as deformation of the body under application of the force.