Why female athletes tear their ACL more often than men

HostI was looking at the injury list for the pro soccer league the other day and it was pretty shocking. It felt like every other star player was out with the same knee injury. Why does this seem to hit women so much harder than men?

GuestIt's a massive gap that we're only just starting to take seriously. In sports that involve lots of jumping and sudden turns, like soccer or basketball, women tear the ACL about three to six times more often than men do. The ACL is basically a tough strap of tissue inside the knee that keeps the joint stable. For a long time, people just said women were built differently or were more fragile, but we now know it's a mix of three things. It's how the body is shaped, how the hormones work, and how girls are taught to move from a young age.

HostIs it mostly just about having wider hips?

GuestThat's a big part of it. Because women generally have wider hips for giving birth, it creates a sharper angle from the hip down to the knee. This is often called the Q-angle. It means that when a woman lands or cuts, her knees naturally want to cave inward. But there's also a hidden factor inside the bone. At the bottom of the thigh bone, there's a little groove where that knee strap sits. In many women, that groove is narrower and shaped more like a letter A than a letter U. When the knee twists, the bone can actually pinch or saw into the ligament. It's like a rope getting frayed because the hole it passes through is too tight.

HostBut men have different body shapes too. Is there something making the ligament itself weaker?

GuestThere's a chemical side to this that we can't ignore. The hormones in a woman's body, especially estrogen, actually change the physical properties of her tissues. When those hormone levels go up, the ligaments can get a bit more stretchy and loose. That doesn't mean a woman will get hurt just by walking, but in a high-speed game, that extra looseness means the knee has less of a safety net. If you make a sudden turn and the joint is just a little too flexible, the ligament takes a hit it can't handle.

HostThat sounds like a tough hand to be dealt. Is it just a losing game because of how the body is built?

GuestNot at all, because the biggest factor is actually something we can change, which is how the brain tells the muscles to move. If you watch a group of boys and girls jump off a high box, the boys usually land with their knees bent and their hips back. The girls often land with their legs very straight and their knees turning in. That upright, stiff landing is a disaster. It forces the tiny knee strap to take all the weight of the jump instead of letting the big muscles in the butt and the back of the leg soak up the shock.

HostWhy do they move so differently?

GuestIt's largely about the training gap. For decades, girls weren't encouraged to lift weights or do jump training as early or as often as boys. If you don't build up the hamstrings on the back of the thigh, they can't help the ACL hold the knee together. We have found that if you put young female athletes through a specific warm-up that teaches them how to land and strengthens those back muscles, you can cut these injuries by half. It's about teaching the nerves to fire the right muscles at the right time.

HostIf we know how to fix it, why is it still such a huge problem in the big leagues?

GuestThe game has changed faster than the science. Women's sports are more intense and faster than ever, but players are still often wearing shoes designed for men's feet and playing on schedules that don't account for their specific recovery needs. Even the cleats on the bottom of a shoe can be a problem. If the studs grip the grass too hard and the foot stays stuck while the body turns, the knee is what breaks. We're finally moving away from treating female athletes like smaller men and starting to look at their knees as a unique puzzle to solve.

HostSo it's everything from the shape of the bones to the studs on their shoes.

GuestThe most promising thing we have found is that just fifteen minutes of the right balance and jump drills before a game can be more effective than any surgery we have come up with so far.

HostThose fifteen minutes of practice could be what keeps the next generation of stars on the field instead of on the sideline in a knee brace.