Neuromodulation in Lower Limb Amputees

Inclusion Criteria: * Participants must be between the ages of 21 and 70 years old. * Participants must have a trans-tibial amputation and phantom limb pain in at least one leg Exclusion Criteria: * Participants must not have any serious disease, disorder, or infection (ex. blood or bone disorder or infection) that could affect their ability to participate in this study. * Female participants of child-bearing potential must not be pregnant or breast feeding, or plan to become pregnant during the course of the study. * Participants must not have any implanted stimulators or pulse generators * Participants must not have any implanted metallic devices in their torso and/or legs * Participants must not have heart disease, including known arrhythmia