Often with knee injuries, the ACL becomes damaged or torn. In fact, this is quite common. Each year, about 300,000 people worldwide undergo surgery to repair a damaged ACL. The injury is common among athletes, and it can also occur in the workplace in jobs that require physical exertion. Women are more susceptible to such injuries than are men. Studies have shown that the reason for this may be that in sports, women tend to hold their trunks and hips in a more erect posture while performing running and jumping maneuvers.