ligaments: the anterior and posterior. These bands of muscle are tasked in keeping the tibia from slipping forwards or backwards, and are crossed like the letter “X” to assure this happens. Unfortunately, like any part of the body, these ligaments are prone to injury; the anterior is the most commonly injured, and the harder of the two to recover from. Severe injury to the Anterior Cruciate Ligament has slowly become an epidemic in the sporting world, particularly in the National Football League; the NFL has seen an increase in ACL injuries over recent years, and there are several possible causes to blame for the uptick: rule changes, preseason training, and genetics.