An ACL tear is an athlete鈥檚 worst nightmare. One of the knee鈥檚 main stabilizers, the ACL keeps you upright when you plant and pivot. Reconstructive surgery and months of recovery often follow ACL tears.

Yet a new suggests that surgery isn鈥檛 required for almost 25 percent of first-time, skiing-induced ACL injuries.

鈥淚t is unclear why, but this phenomenon is unique to recreational skiers,鈥� says Dr. Robert Marx, M.D., professor of orthopedic surgery at the Hospital for Special Surgery in New York City and author of the study.

The reason might have something to do with skiing, says Steven B. Singleton, M.D., FACS, founding partner of the Steadman Hawkins Clinic of the Carolinas. Because many recreational skiers injure themselves at lower speeds, the force of the energy transfer through the knee often leads only to partial ACL tears, which can sometimes heal on their own. Beyond the force of impact, the fixed position of the ankle and foot within the ski boot might help minimize tears, says the study’s co-author, Dr. Demetris Delos.

Researchers for the study compiled the medical records of 63 recreational skiers with acute, first-time ACL tears. Of that number, 29 chose to skip surgery. On follow-up visits six to eight weeks later, 17 performed positively on tests, potentially indicating an ACL that was healing itself.

Two years later, out of the 11 patients who were still seeing Dr. Marx, 10 had maintained positive scores, indicating a healed ACL, and eight continued to ski recreationally, without the use of a brace.

鈥淣ot all heal,鈥� writes Marx. 鈥淚f [they don鈥檛], they may require surgery.鈥�

But reconstructive surgery isn鈥檛 a surefire solution to future ACL integrity. According to the , surgery is successful in the long-term between eighty-two and ninety-five percent of the time.

The bottom line: Patience, young grasshopper. If you鈥檙e a recreational skier and this is the first time you鈥檝e injured your ACL, ask your doctor if you should wait before scheduling surgery. A minor tear might heal itself.

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Unfortunately for cubicle club members everywhere, science says no.

Despite the that adults get 30 minutes of moderate exercise five days a week, or 25 minutes of vigorous exercise three days a week, shows that your health depends on movement, not just how long and hard you workout.

While the study was confined to older adults, it found that an added hour of sedentary behavior increased a particpant’s risk of being unable to perform basic daily tasks (such as getting in and out of bed) by 46 percent, even if he met weekly exercise guidlines.

“Sedentary behavior is to exercise as a Big Mac is to a salad,” says Dan Heil, Ph.D. and professor of exercise physiology at Montana State University. “One healthy behavior doesn’t cancel out the effects of an unhealthy behavior.”

Simply put, even if you’re a serious athlete, sitting doesn’t discriminate. But sitting doesn’t have to be so bad. by obesity specialist at the Mayo Clinic (and notably, inventor of the treadmill desk), Dr. James Levine, shows that the energy expended during small movements like getting up to get a glass of water, or fidgeting can counteract the effects of sitting.

The bottom line: Sitting is more harmful the longer you do it, regardless of your fitness level. Aim to walk or stretch at least once an hour, even if it’s simply standing to do office work. And for the bold among you, there’s always the treadmill desk.聽

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