Previously housebound Parkinson's disease patients are now able to walk more freely thanks to a treatment developed by Canadian researchers.
A quarter of Parkinson's patients have difficulty walking as the disease wears on, often freezing on the spot and falling.
The treatment, using electrical stimulation to the spine, has restored the movement of patients with chronic Parkinson's disease and has been hailed by Parkinson's UK for its potential impact on an aspect of the disease for which there had been no treatment.
One of the researchers who developed it, Prof Mandar Jog of Western University in London, Ontario, said the scale of benefit to patients of his new treatment was "beyond his wildest dreams".
"Most of our patients have had the disease for 15 years and have not walked with any confidence for several years," he said.
"For them to go from being home-bound with the risk of falling to being able to go on trips to the mall and have vacations is remarkable for me to see."
Normal walking involves the brain sending instructions to the legs to move. It then receives signals back when the movement has been completed before sending instructions for the next step.
Prof Jog believes Parkinson's disease reduces the signals coming back to the brain - breaking the loop and causing the patient to freeze. The implant his team has developed boosts that signal, enabling the patient to walk normally.
He was surprised to find that the treatment was long-lasting and worked even when the implant was turned off.
"This is a completely different rehabilitation therapy," he said. "We had thought that the movement problems occurred in Parkinson's patients because signals from the brain to the legs were not getting through.
"But it seems that it's the signals getting back to the brain that are degraded."
Brain scans showed that before patients received the electrical treatment, the areas that control movement were not working properly. But a few months into the treatment those areas were restored.
Gail Jardine, 66, is among the patients who has benefited from the treatment.
Before she received the implant two months ago, Gail kept freezing on the spot, and she would fall over two or three times a day.
She lost her confidence and stopped walking in the countryside in Kitchener, Ontario - something she loved doing with her husband, Stan.
Now she can walk with Stan in the park for the first time in more than two years.
"I can walk a lot better," she said. "I haven't fallen since I started the treatment. It's given me more confidence and I'm looking forward to taking more walks with Stan and maybe even go on my own".
Another beneficiary is Guy Alden, 70, a deacon at a Catholic church in London, Ontario. He was forced to retire in 2012 because of his Parkinson's disease.
His greatest regret was that it curtailed his work in the community, such as his prison visits.
"I was freezing a lot when I was in a crowd or crossing a threshold in a mall. Everyone would be looking at me. It was very embarrassing," he told me.
"Now I can walk in crowds. My wife and I even went on holiday to Maui and I didn't need to use my wheelchair at any point. There were a lot of narrow roads and a lot of (slopes) and I did all of that pretty well."
Dr Beckie Port, research manager at Parkinson's UK, said: "The results seen in this small-scale pilot study are very promising and the therapy certainly warrants further investigation.
"Should future studies show the same level of promise, it has the potential to dramatically improve quality of life, giving people with Parkinson's the freedom to enjoy everyday activities."