Generating synthetic gait patterns based on benchmark datasets for controlling prosthetic legs.
Minjae Kim, Levi J Hargrove
PMID 37667313WHAT IT FOUND
A new control method for prosthetic legs worked in four people without amputation, allowing them to walk and stand.
However, their movements were much jerkier than natural walking, and the system's safety has not yet been validated for actual amputees.
Key findings
01Four individuals without amputation successfully performed intended ambulation modes, including walking and standing transitions, using the prosthetic leg.
02The gait smoothness of the participants was worse than benchmark data, with jerk values for the thigh, knee, and ankle being 3.72, 4.34, and 1.15 times higher, respectively.
03The study explicitly states that stability has not yet been validated and that the results do not guarantee sufficient robustness for practical use.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was conducted on individuals without amputation using a bypass socket, not on actual amputees. The stability and robustness of the control system have not been validated, which the authors state is the most significant limitation. Movement smoothness was significantly worse than natural gait, with high jerk values. Participants reported discomfort and a lack of push-off power, suggesting the control parameters may not yet be safe or comfortable for clinical use. The system misinterpreted some movements, such as turning, leading to undesirable knee flexion.
Declared interests
The research was supported by the N.I.H. and non-U.S. government grants. No other conflicts of interest are reported in the provided text.
The easy way to misread this
Do not interpret the successful completion of tasks by non-amputee participants as evidence that this prosthetic control is ready for patients. The study explicitly states that stability has not been validated, and the movements produced were significantly jerkier and less smooth than natural walking.