Stable, three degree-of-freedom myoelectric prosthetic control via chronic bipolar intramuscular electrodes: a case study.
Hendrik Adriaan Dewald, Platon Lukyanenko, Joris M Lambrecht and 4 others
PMID 31752886WHAT IT FOUND
In one man with a forearm amputation, an implanted-electrode controller moved three virtual hand movements reliably over 12 weeks and across arm positions.
Performance was slightly less efficient than his intact hand. Not evidence for a real prosthetic hand in daily tasks.
Key findings
01Across six sessions over 12 weeks, the implanted-electrode controller matched virtual hand postures with a 100% success rate under the task criteria.
02Changing arm position, including holding a 650 g cylinder, did not show a statistically detectable difference in virtual control performance across six postures.
03In one session, the implanted electrodes showed lower channel crosstalk and higher signal-to-noise ratio than surface electrodes.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
Only one participant was studied, and he underwent invasive surgery with percutaneous leads that needed daily maintenance. The percutaneous site had three blockage events over 36 months, although no major infection occurred. Performance was measured in a virtual hand, and the link between these tests and real prosthetic use or daily activities was not established. The intact hand comparison used a position controller, while the implanted-electrode controller used velocity control, so the two were not directly comparable. The implanted-electrode controller was not compared against a surface-electrode controller; surface electrodes were only compared for signal quality. The surface electrode comparison used an untargeted ring placement, not muscle-targeted surface electrodes. Learning effects were unclear because testing was brief and infrequent.
Declared interests
The paper lists research support from NIH extramural, non-U.S. government, and U.S. government non-PHS sources. It does not include an author conflict-of-interest declaration.
The easy way to misread this
Do not read this as proof that an implanted-electrode controller improves real prosthetic hand use in daily life. Only one participant was tested, control was measured in a virtual hand, and no physical prosthesis outcomes were reported.