Use of Subtle Vibration to Improve Walking Ability by Lower Limb Amputees

• Gait variability [ Time Frame: Testing with and without stochastic resonance will occur within a single laboratory visit on one day ] [ Designated as safety issue: No ]
  

One of the many complications of diabetes is the loss of sensation in the feet. This sensory deficit can negatively impact the postural stability and mobility of non-amputees, since without feedback, it is simply more difficult to stand and walk. For lower limb amputees, the problem is compounded. These patients often have difficulty with prosthetic limb placement during maneuvering tasks, exhibit dramatic increases in the movement of their center of pressure during quiet standing, and both clinical and observational gait analysis reveal significant changes in their gait pattern relative to non-amputees.

Our work proposes to explore the use of a novel prosthetic intervention for diabetic lower limb amputees. We hypothesize that our intervention will sufficiently enhance proprioception to result in measurably improved postural stability and locomotor function for these patients. The intervention is based on a phenomenon known as stochastic resonance, whereby the application of sub-threshold vibration enables mechano-receptors previously unable to respond to stimuli to become more susceptible to depolarization. For veterans with neuropathic proprioceptive losses, stochastic resonance may facilitate a functional response from subtle stimuli where gross inputs were formerly required.