Simulating the restoration of standing balance at leaning postures with functional neuromuscular stimulation following spinal cord injury

Medical & Biological Engineering & Computing
Raviraj NatarajRonald J Triolo

Abstract

In this simulation study, we present and examine methods to develop a feedback controller for a neuroprosthesis that restores forward and side leaning function during standing following complete thoracic-level spinal cord injury. Achieving leaning postures away from erect stance with functional neuromuscular stimulation (FNS) would allow users to extend their reaching capabilities. Utilizing a 3-D computer model of human stance, an FNS control system based on total-body center of mass (CoM) kinematics (position, acceleration) is developed and tested in simulation. CoM kinematics drive an artificial neural network to modulate muscle excitations and reduce the upper extremity loading, presumably against a walker or similar support surface, required to resist the effects of postural perturbations. Furthermore, a novel method to robustly estimate the feedback kinematics for standing applications is also presented while assuming 3-D accelerometer signals at locations consistent with a proposed implantable networked neuroprosthesis system. For shifting and balance at leaning postures, respectively, center of mass position and acceleration could be approximated to within 20% of the maximum value, with strong correlations (R > 0.9) bet...Continue Reading

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Jul 10, 2012·Journal of Rehabilitation Research and Development·Raviraj NatarajRonald J Triolo
Jan 10, 2013·Journal of Rehabilitation Research and Development·Raviraj NatarajRonald J Triolo
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Citations

Jul 6, 2017·Frontiers in Neuroscience·Hossein RouhaniMilos R Popovic
Jun 12, 2017·Journal of Neuroengineering and Rehabilitation·Alexander J HuntRonald J Triolo
Jul 25, 2017·Medical & Biological Engineering & Computing·Musa L AuduRonald J Triolo
Jun 4, 2018·Journal of Neuroscience Methods·Nathaniel R BridgesKaren A Moxon

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