Ironic as it may sound, a torn ligament in knee is a problem most commonly faced by people with an active lifestyle.  If you are a runner, an athlete, an avid football player, or if you indulge in a high degree of physical activity, there are more chances of you experiencing torn ligament in knee. Thankfully, the effects of the injury and its related pain are transient in nature and with proper rest and regular physiotherapy based exercises, you can strengthen the affected muscles and restore the proper functioning of the knee over a period.