Continuous locomotion-mode identification for prosthetic legs based on neuromuscular-mechanical fusion

IEEE Trans Biomed Eng. 2011 Oct;58(10):2867-75. doi: 10.1109/TBME.2011.2161671. Epub 2011 Jul 14.


In this study, we developed an algorithm based on neuromuscular-mechanical fusion to continuously recognize a variety of locomotion modes performed by patients with transfemoral (TF) amputations. Electromyographic (EMG) signals recorded from gluteal and residual thigh muscles and ground reaction forces/moments measured from the prosthetic pylon were used as inputs to a phase-dependent pattern classifier for continuous locomotion-mode identification. The algorithm was evaluated using data collected from five patients with TF amputations. The results showed that neuromuscular-mechanical fusion outperformed methods that used only EMG signals or mechanical information. For continuous performance of one walking mode (i.e., static state), the interface based on neuromuscular-mechanical fusion and a support vector machine (SVM) algorithm produced 99% or higher accuracy in the stance phase and 95% accuracy in the swing phase for locomotion-mode recognition. During mode transitions, the fusion-based SVM method correctly recognized all transitions with a sufficient predication time. These promising results demonstrate the potential of the continuous locomotion-mode classifier based on neuromuscular-mechanical fusion for neural control of prosthetic legs.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amputees / rehabilitation
  • Artificial Limbs*
  • Electromyography / methods*
  • Humans
  • Locomotion / physiology*
  • Muscle, Skeletal / physiology
  • Signal Processing, Computer-Assisted*
  • Support Vector Machine*
  • Thigh