A very painful injury seen in ERs by doctors like Dr. Josyann Abisaab is an ACL tear. The ACL (anterior cruciate ligament) is one of the four main ligaments which control the motion of the knee. This injury usually occurs in “weekend warriors” who play only once or twice a week, and do not build up the required strength and flexibility in between games. To prevent ER visits with torn ACLs, strengthen the area by doing lunges, squats, hamstring exercises and leg presses on a regular basis. This will help secure and brace the knee during games.