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Motorcycle helmet myth debunked (2/10)

February 10, 2011
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New research provides fresh ammo for the battle over motorcycle helmet laws – and anti-helmet activists won’t be the ones using it.

A study by Johns Hopkins School of Medicine shows that helmets appear to decrease the risk of cervical spine injury -- contrary to earlier research suggesting that helmets could actually make spinal injuries more likely.

“We are debunking a popular myth that wearing a helmet while riding a motorcycle can be detrimental during a motorcycle crash,” says study leader Adil H. Haider, M.D., M.P.H., an assistant professor of surgery at Johns Hopkins. Haider said the new evidence should cause legislators to revisit the issue of mandatory helmet laws. “There is no doubt that helmets save lives and reduce head injury. And now we know they are also associated with a decreased risk of cervical spine injury.”

For more than two decades, the researchers say, activists lobbying against universal helmet laws have cited a small study suggesting that, in the event of a crash, the weight of a helmet could cause significant torque on the neck that would be devastating to the spine. But results of the new study, published online in the Journal of the American College of Surgeons, shows that helmeted riders were 22 percent less likely to suffer cervical spine injury than those without helmets. The study reviewed and mined the National Trauma Databank, looking through information on more than 40,000 motorcycle collisions between 2002 and 2006.

Despite the evidence, many states, including Florida, Pennsylvania and Texas, have over the past 15 years repealed their mandatory helmet use laws after lobbying from motorcycle riders, Haider says. Anti-helmet activists often cite a 25-year-old study which found more spine injuries in helmet wearers. That study has come under criticism from the National Highway Traffic Safety Administration for flawed statistical reasoning.

“Additionally, helmet technology has significantly improved since that time — now helmets are much lighter but even sturdier and more protective” Haider says.

Forty years ago, Haider says, nearly all states required helmets for motorcyclists of any age in the United States. Today, helmets are mandatory for all riders in only 20 states, Puerto Rico and the District of Columbia.

Motorcycle use has risen sharply over the past 10 years in the United States. Since 1997, motorcycle injuries in the U.S. have increased by roughly 5,000 per year and motorcycle fatalities have nearly doubled, according to the new journal article.

Haider’s study found that in a crash, helmet wearers were 65% less likely to suffer a traumatic brain injury and 37% less likely to die in. But the new paper, Haider says, is the strongest evidence yet that helmets significantly reduce cervical spine injury, which can result in paralysis.

Other Johns Hopkins researchers who contributed to this study include Curt Bone; Keshia M. Pollack, Ph.D., M.P.H.; Cassandra Villegas, M.P.H.; Kent Stevens, M.D., M.P.H.; David T. Efron, M.D.; and Elliott R. Haut, M.D.

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