Chronic nerve health following implantation of femoral nerve cuff electrodes.
Max J Freeberg, Gilles C J Pinault, Dustin J Tyler and 2 others
PMID 32664972WHAT IT FOUND
In one person with spinal cord injury, femoral nerve implants caused only temporary nerve irritation that resolved by 15 weeks.
Stimulation thresholds stabilized over a year, and the subject regained the ability to stand unaided for over 30 minutes.
Key findings
01Nerve irritation from the implant was temporary, with abnormal electrical signs in muscles resolving completely by 15 weeks post-surgery.
02Stimulation charge thresholds peaked at two months but declined and stabilized by one year, indicating consistent nerve-electrode interaction.
03The subject supported 93.1% of their body weight through their legs while standing using the neuroprosthesis.
STILL TO COME
How it was doneWhat they found
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What it does not show
This is a single case report, so findings cannot be generalized to other patients or nerve implant designs. The subject had a specific injury level (C5 AIS C) and low body mass, which may have influenced the ease of standing and nerve health outcomes. All 16 electrode contacts were only accessible for testing during the first 6 months; after that, only 6 selected contacts were monitored. Motor nerve conduction velocities were estimated using approximated distances rather than direct nerve measurements, which may reduce accuracy.
Declared interests
Funded by the National Institute of Biomedical Imaging and Bioengineering and the U.S. Department of Veterans Affairs. No commercial conflicts of interest are listed in the provided text.
The easy way to misread this
Do not interpret the temporary nerve irritation or the loss of one sensory nerve response as a failure of the technology or a sign of ongoing damage. These changes resolved, and the subject achieved functional standing. However, do not assume this safety profile applies to other implant designs or patients without similar monitoring.