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Neural interfacing architecture enables enhanced motor control and residual limb functionality postamputation.

Shriya S Srinivasan1,2,3, Samantha Gutierrez-Arango4, Ashley Chia-En Teng5

  • 1MIT Center for Extreme Bionics, Biomechatronics Group, Massachusetts Institute of Technology, Cambridge, MA 02139; shriyas@mit.edu hherr@media.mit.edu.

Proceedings of the National Academy of Sciences of the United States of America
|February 17, 2021
PubMed
Summary

New below-knee amputation surgery using agonist-antagonist myoneural interfaces (AMIs) significantly improves patient mobility and control. This advanced technique enhances neuromuscular dynamics and offers better prosthetic integration compared to traditional methods.

Keywords:
amputationneural engineeringphysiologyprostheticssensory feedback

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Rehabilitation Medicine

Background:

  • Traditional below-knee amputation (BKA) often results in diminished mobility and quality of life for patients.
  • Existing prosthetic technologies struggle to fully restore natural limb function and control.
  • Need for advanced amputation techniques that improve neuromuscular control and prosthetic integration.

Purpose of the Study:

  • To evaluate a modified BKA procedure incorporating agonist-antagonist myoneural interfaces (AMIs).
  • To compare the functional outcomes and patient-reported benefits of AMI-BKA versus traditional BKA.
  • To assess the impact of AMIs on neuromuscular dynamics, proprioception, and prosthetic controllability.

Main Methods:

  • Prospective, nonrandomized, unmasked study comparing 15 subjects with AMI-BKA to 7 subjects with traditional BKA.
  • Surgical preservation and coupling of agonist-antagonist muscle pairs for ankle and subtalar joints.
  • Assessment of residual limb musculature control, efferent signal differentiation, movement precision, and proprioceptive inputs.

Main Results:

  • AMI-BKA subjects showed significantly greater control, more differentiable EMG signals, and enhanced movement precision (P < 0.008).
  • Higher fascicle strains in AMI-BKA subjects suggest improved proprioception (P < 0.05).
  • AMI-BKA subjects reported greater phantom range of motion (P < 0.05) and less pain post-surgery (P < 0.05).

Conclusions:

  • The AMI-BKA procedure enhances physiological neuromuscular dynamics, proprioception, and phantom limb perception.
  • AMI-BKA yields more differentiable EMG signals for improved myoelectric prosthesis control.
  • This modified amputation technique offers superior clinical outcomes compared to traditional BKA.