A 42-year-old man who was paralyzed following a wrestling injury was able to voluntarily move his legs thanks to the new approach; ©UCLA/ Edgerton Lab
In a study conducted at UCLA, five men who had been completely paralyzed were able to move their legs in a rhythmic motion thanks to a new, noninvasive procedure that stimulates the spinal cord.
It is believed to be the first time voluntary leg movements have ever been relearned in completely paralyzed patients without surgery. The results are reported in the Journal of Neurotrauma.
"These findings tell us we have to look at spinal cord injury in a new way," said V. Reggie Edgerton, senior author of the research and a UCLA distinguished professor of integrative biology and physiology, neurobiology and neurosurgery.
Edgerton said although it likely will be years before the new approaches are widely available, he now believes that it is possible to significantly improve quality of life for patients with severe spinal cord injuries, and to help them recover multiple body functions.
"People who are paralyzed are often told very early on, 'Do not have any hope because you are not going to recover function below the lesion,'" he said. "They have been told that for decades, and still are today. But this was ridiculous before, and it's even more ridiculous now."
Last year, Edgerton and colleagues, the University of Louisville's Susan Harkema and Claudia Angeli and UCLA's Yury Gerasimenko, reported that four young men who had been paralyzed for years were able to move their legs, hips, ankles and toes following epidural electrical stimulation of their spinal cords. But that procedure required that the stimulator be surgically implanted and activated - and that device remains under the skin for years.
Earlier this year, a team led by Gerasimenko and Edgerton, along with Ruslan Gorodnichev of Russia's Velikie Luky State Academy of Physical Education and Sport, demonstrated that they could induce involuntary stepping movements in healthy, uninjured people using noninvasive stimulation. The finding led Edgerton to believe the same approach could be effective for people with complete paralysis.
In the new research, five men were given one 45-minute training session per week for 18 weeks. For four weeks, the men were also given twice daily doses of buspirone, a drug often used to treat anxiety disorders.
Researchers placed electrodes at strategic points on the skin, at the lower back and near the tailbone and then administered a unique pattern of electrical currents. The electrical charges caused no discomfort to the patients, who were lying down.
"The fact that they regained voluntary control so quickly must mean that they had neural connections that were dormant, which we reawakened," said Edgerton, who for nearly 40 years has conducted research on how the neural networks in the spinal cord regain control of standing, stepping and voluntary control of movements after paralysis. "It was remarkable."
Edgerton said most experts, including himself, had assumed that people who were completely paralyzed would no longer have had neural connections across the area of the spinal cord injury.
The researchers do not know yet whether patients who are completely paralyzed can be trained to fully bear their weight and walk. But he and colleagues have now published data on nine people who have regained voluntary control of their legs - four with epidural implants and five in the latest study.
"Many people thought just a few years ago we might be able to achieve these results in perhaps one out of 100 subjects, but now we have nine of nine," Edgerton said. "I think it is a big deal, and when the subjects see their legs moving for the first time after paralysis, they say it's a big deal."
The men in the newest study ranged in age from 19 to 56; their injuries were suffered during athletic activities or, in one case, in an car accident. All have been completely paralyzed for at least two years. Their identities are not being released.
MEDICA-tradefair.com; Source: University of California - Los Angeles