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Sensing Muscle Deformation for Upper-Limb Prosthetic Control: a Narrative Review.

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Use of RPNIs and Implanted Electrodes for Prosthetic Wrist and Multi-Grip Hand Control during Functional Tasks: A Case Study.

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Related Experiment Video

Updated: Nov 26, 2025

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals
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The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals

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Regenerative peripheral nerve interface free muscle graft mass and function.

Yaxi Hu1,2, Daniel C Ursu1, Racquel A Sohasky1

  • 1Department of Surgery, Section of Plastic and Reconstructive Surgery, University of Michigan, Ann Arbor, Michigan, USA.

Muscle & Nerve
|December 8, 2020
PubMed
Summary

Smaller muscle grafts in regenerative peripheral nerve interfaces (RPNIs) yield better nerve signal transduction. Larger grafts showed reduced muscle fiber regeneration and viability in rat models.

Keywords:
EMGRPNImuscle graftprosthesis controlregeneration

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Regenerative Medicine

Background:

  • Regenerative peripheral nerve interfaces (RPNIs) are crucial for high-fidelity neuroprosthetic control.
  • Current RPNI construction in rats uses ~150 mg skeletal muscle grafts.
  • The impact of larger muscle graft sizes on RPNI signal transduction remains unexplored.

Purpose of the Study:

  • To investigate the relationship between skeletal muscle graft size and RPNI performance.
  • To determine if larger grafts enhance neural signal transduction for neuroprosthetics.

Main Methods:

  • RPNIs were created using varying skeletal muscle graft masses (150, 300, 600, 1200 mg) attached to the peroneal nerve in rats.
  • A control group involved peroneal nerve transection without repair.
  • Functional assessments were performed 3 months post-surgery.

Main Results:

  • RPNIs with 150 mg and 300 mg grafts demonstrated significantly higher compound muscle action potentials (CMAPs) and muscle force compared to larger grafts.
  • Larger muscle grafts (600 mg and 1200 mg) exhibited central regions with a lack of regenerated muscle fibers.
  • Specific muscle force was also superior in smaller RPNI constructs.

Conclusions:

  • Optimal electrical signaling and tissue viability in RPNIs are achieved with smaller muscle graft sizes.
  • Larger muscle grafts may impede effective regeneration and function in RPNI constructs.
  • Findings suggest that graft size is a critical factor in RPNI design for neuroprosthetic applications.