United States Sees Rise in Traumatic Spinal Cord Injuries

The number of serious traumatic spinal cord injuries is on the rise in the United States, and the leading cause no longer appears to be motor vehicle crashes, but falls, new Johns Hopkins research suggests.

The same research shows, moreover, that rates of these injuries—whose symptoms range from temporary numbness to full-blown paralysis—are rising fastest among older people, suggesting that efforts to prevent falls in the elderly could significantly curb the total number of spinal injuries.

“We have demonstrated how costly traumatic spinal cord injury is and how lethal and disabling it can be among older people,” noted Shalini Selvarajah, M.D., M.P.H., a postdoctoral surgical research fellow at the Johns Hopkins University School of Medicine (Baltimore, Md.) and leader of the study published online in the Journal of Neurotrauma. “It’s an area that is ripe for prevention.”

For their study, the Johns Hopkins researchers analyzed a nationally representative sample of 43,137 adults treated in hospital emergency rooms for spinal cord injury in the United States between 2007 and 2009. While the incidence among those aged 18 to 64 ranged from 52.3 per million in 2007 to 49.9 per million in 2009, the incidence per million in those 65 and older increased from 79.4 in 2007 to 87.7 in 2009. Falls were the leading cause of traumatic spinal cord injury over the three-year study period (41.5 percent), followed by motor vehicle crashes (35.5 percent). Fall-related spinal cord injuries increased during the study period overall. Among the elderly, they jumped from 23.6 percent to 30 percent of injuries.

The average age of adults with a traumatic spinal cord injury in a previous study that covered the years 2000 to 2005 was 41; the new study suggests it is now 51.

The investigators said that even when taking into account injury severity and other illnesses experienced by the patients, older adults with traumatic spinal cord injury are four times more likely to die in the emergency room from such an injury compared to younger adults. If they survive and are admitted, they are six times more likely to die during their inpatient stay.

While the researchers admit they cannot pinpoint the exact reason that falls have surpassed car crashes as a cause of traumatic spinal injuries, they believe it may be a combination of the aging population, the more active lifestyles of many Americans over age 65, and airbags and seatbelt laws that help drivers and passengers to survive automobile crashes.

“We are seeing a changing face in the epidemiology of spinal cord injury,” said Edward R. Hammond, M.D., Ph.D., a research associate at the International Center for Spinal Cord Injury at Kennedy Krieger Institute (Baltimore) and another of the study’s leaders.

Beyond the personal toll of disability and death, spinal cord injuries are a growing financial burden on the healthcare system, researchers noted. They estimated that from 2007 to 2009, emergency room charges alone for traumatic spinal cord injury patients totaled $1.6 billion. But that is “just the first drop in a long-filling bucket,” said Eric B. Schneider, Ph.D., an epidemiologist at the Johns Hopkins University School of Medicine’s Center for Surgical Trials and Outcomes Research. Those charges increased 20 percent over the study period, far more than merely the cost of inflation.

The spinal cord injuries captured by the data for this study were those serious enough to land patients in the emergency room and included temporary bruising to severed or permanently damaged cords that cause paralysis, difficulty breathing, an inability to fill and empty the bladder, and other motor disabilities.

According to the National Spinal Cord Injury Statistical Center, lifetime costs of care for those with serious spinal cord injuries can range from $1 million to $5 million depending on the age of the person at the time of injury and the severity of the damage. Improvements in rehabilitative care are leading to longer life expectancies among spinal cord injury patients as well as bigger medical bills.

“With so much emphasis on trying to reduce healthcare costs right now, this is another reason why preventing the injury altogether is so vital,” Selvarajah said.

A recent campaign by the National Institutes of Health is funding the search for better ways to prevent falls that lead to traumatic brain injury in the elderly. Schneider said the effort also could lead to a coincidental reduction in traumatic spinal cord injuries.

The spinal cord is a long bundle of nerve tissue that sits inside a bony structure called the vertebral column or backbone. It is the conduit that connects the brain to the rest of the body, enabling nearly all of the latter’s functions.

Other Johns Hopkins researchers involved in the study include Adil H. Haider, M.D., M.P.H.; Christopher J. Abularrage, M.D.; Daniel Becker, M.D.; Nitasha Dhiman, M.S.P.H.; Omar Hyder, M.D., M.S.; and James H. Black III, M.D.