The Crappy Reasons Why Female Athletes Are More Prone To This Common Injury

Photographed by Rockie Nolan.
A version of this story originally appeared on Shape.

According to a 2010 study published in the North American Journal of Sports Physical Therapy, women who practiced "jumping and pivoting" sports (like running) were four to six times more likely to end up tearing their ACLs (the ligament that runs through the middle of your knee) than men. This is a pretty dramatic difference, right? Shape thought so, too.

To better understand why women are at such a greater risk of ACL injuries, Shape spoke with Armin Tehrany, MD, orthopedic surgeon, shoulder and knee specialist, and founder of Manhattan Orthopedic Care.

Related: 7 Workout Routines Secretly Causing Knee Pain

For starters, Dr. Tehrany said that this is an unfortunate result of most women's anatomy, namely wider-set hips. "The alignment of a man's leg is straight, because they have a narrower pelvis. A woman has a wider pelvis, so the knee is no longer aligned straight," he explained. This is important, because a wider pelvis creates a bigger angle between the thigh bone and the shin bone, which puts the ACL at a greater risk of being twisted or torn.

Related: Exercise and Your Menstrual Cycle: What Your Period Means for Your Workout Schedule

This one's a little less obvious — Dr. Tehrany said that our menstrual cycles may also be to blame. During your period, your joints and ligaments loosen, thanks to shifting levels of hormones: "Women usually have looser joints and ligaments than men to begin with. Then, the menstrual cycle can make them get even looser, which means that during pivoting sports or shifting of the knee, the ACL is under more risk of tearing." He added that you should feel free to wear a knee brace on your runs at any point during your cycle.

Luckily, this doesn't mean women need to stop doing activities that involve these movements. It only means that it might be extra important for women to cross-train to keep those quads and hamstrings strong. Dr. Tehrany explained that keeping your strength in these two muscle groups relatively balanced will reduce your risk of an ACL injury.

"Women should seek out a professional — either a physical therapist or personal trainer — for advice on whether or not they have stability between the quad muscles in the front of the knee, versus the hamstring muscles on the back of the knee."

Click through to
Shape for more on staying safe while working out. (Shape)

Related: 10 Knee-Friendly Lower-Body Toners

More from Fitness

Sometimes getting motivated to exercise can be harder than the workout itself. That’s why it helps to think of your gym time as a middle school dance: ...
The benefits of yoga are constantly touted by fitness gurus and scientific researchers alike: practicing yoga has been linked to reducing stress, boosting ...
Working out's a LOT more fun when you can do it on your own terms, in your own crib, with your own tunes, and your own friends
When it comes to rock climbing, an all-or-nothing approach is key
Ashley Graham is breaking barriers. She's the first plus-sized model to cover the Sports Illustrated Swimsuit Issue and she's served as our workout ...
In a move so fitting that we can’t believe we haven’t seen it already, ASOS teamed up with running shoe company Saucony to create glitter running ...
If you ask us, no workout is complete without a killer playlist — and running is no exception. Whether you prefer the trails or the treadmill, the right ...
(Paid Content) Normally, we celebrate getting into a fitness groove. It means that we've committed — on a pretty regular basis — to laying out workout ...
We may not all be able to keep up a daily diet of personal training, SoulCycle, and hot yoga. But there's a lot more to learn from celebrities' workout ...
Update: This story was previously published on Nov 21, 2015. Are you sitting down? Okay, take a minute to assess: Are you slouching in your seat? Are your...
Ah, the plank. Some version of it is used in virtually every type of fitness program, from CrossFit to calisthenics to yoga to pilates, and for good reason...
A new study published in the Journal of the American Medical Association has found that fitness trackers aren't exactly the key to a super-healthy ...
Maybe you're someone who appreciates the sturdiness of genuine leather. Perhaps you can't stand the idea of going to an hour-long vinyasa class without ...
Hailey Langland is a 16-year-old snowboarding star who believes that if you're not having fun doing something, it's not worth doing. "What sets me ...