By: Kaylyn Izzo , Lindsey Theis Hearing a pop come from your knee is never a good sign. In some cases it can mean an ACL tear, which stands for anterior cruciate ligament. But why these tears happen can be different in men and women. In fact, science shows women are actually more prone to ACL injuries. So how can you protect yourself from a tear? We’re doing the research for you so you can focus on harnessing your health.