New Science: Movement, Not Age, Causes Knee Pain

Millions of women have stopped running, jumping, and playing sports because they believed their knees couldn't handle it anymore. A groundbreaking 2025 study just proved that belief wrong.

Researchers analyzed data from over 24,000 people across 13 years and found something surprising. Those with knee osteoarthritis weren't necessarily older—they were simply more sedentary and less physically active.

"There's a far-reaching misconception that as people age, their knees are doomed," says Dr. Abigail Campbell, a sports orthopedic surgeon at NYU Langone. The data tells a different story entirely.

A separate 2023 study followed 2,600 participants for eight years and found that people who did strength training reported significantly less knee pain later in life. The conclusion? Your knees don't wear out from use—they weaken from disuse.

Yes, women do face unique challenges. Hormonal changes during menopause can decrease bone density, and women develop knee arthritis at 1.5 to two times the rate of men. But even these factors don't doom your knees to pain.

The knee is naturally vulnerable because it's just a hinge joint, not a protective ball and socket like the hip. It bears up to 10 times your body weight during normal activities, making it sensitive to small changes in strength or movement patterns.

That sensitivity is actually good news. When your knee hurts, it's usually telling you something fixable—like weak quads or an old injury that needs attention—not that you're too old to be active.

The Bright Side

Knee pain responds remarkably well to intervention. Physical therapists report that patients who restart strength training often see dramatic improvements, even with existing arthritis. Running doesn't cause arthritis or make it worse, according to Dr. Campbell—it just temporarily irritates joints that need more support.

The real risk to your knees isn't getting older or staying active. It's believing the old story that pain is inevitable and stopping the very movements that keep your joints healthy and strong.

Women in their 60s and 70s are now sprinting, jumping, and playing tennis because they learned the truth: motion is medicine for your knees.