A recent study found that women were nearly three times more likely to sustain an anterior cruciate ligament (ACL) injury while they were ovulating than during other points in their menstrual cycle. This pattern emerged only among women not on birth control pills. The findings suggest that oral contraception may provide some measure of protection from the injury. 65 women with ACL injuries were studied at the University of Michigan. The lead author of the study, Edward M. Wojtys, M.D. said that the findings did not suggest that birth control pills offer a way to prevent ACL injuries.