Original broadcast date: May 10, 2009

Why are women two to eight times more likely to suffer anterior cruciate ligament (ACL) injuries than men? Several studies published in the British Journal of Sports Medicine and The American Journal of Sports Medicine from the Faculty of Kinesiology at the University of Calgary points to a relationship between a woman’s menstrual cycle and the effect it has on the laxity of her knee joint.

• Darren Stefanyshyn, PhD, P.Eng, Associate Professor in the Human Performance Laboratory, Faculty of Kinesiology and Adjunct Associate Professor, Department of Mechanical and Manufacturing Engineering at the University of Calgary