But new French research published in the New England Journal of Medicine last week found that a spinal cord implant could help advanced Parkinson's patients get back on their feet.
Earlier this year neurosurgeon Jocelyne Bloch and Gregoire Courtine revealed that such an implant had enabled three paralysed people to walk again.
Both were also involved in the latest research, which tested a similar implant on a 48-year-old woman.
While the woman did not have Parkinson's, she had such similar symptoms -- including orthostatic hypotension -- that she was initially diagnosed with the disease.
For paralysed people, the spinal cord implant mimics how the brain sends electrical pulses to muscles, reconnecting a severed link.
But for orthostatic hypotension, it stimulates the regulator in the brain that senses the need to send more blood when people stand upright.
Before receiving the implant, the woman would faint after a taking a few of steps.
Three months after the surgery, she was able to walk more than 250 metres (820 feet) with the help of a walking frame, the study said.
"She is not cured, she would not run a marathon, but this surgery has clearly improved her quality of life," Bloch told AFP.
