Spinal zap aims to give amputees back their sense of touch

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Subjects must have an amputation of one lower limb, at a level between the ankle and knee joints. Minor amputation of the contralateral limb (i.e. toes or partial foot) is not exclusionary. 2. Subjects must be over 6 months post-amputation at the time of lead placement. 3. Subjects must be between the ages of 22 and 70 years old. Participants outside this age range may be at an increased medical risk and have an increased risk of fatigue during testing. 4. Subjects must have used their current prosthesis for at least 6 months and achieved at least K-1 ambulator status at the time of lead placement, as determined by the Amputee Mobility Predictor. Exclusion Criteria: 1. Subjects must not have any serious disease or disorder that could affect their ability to participate in this study. 2. Female subjects of childbearing age must not be pregnant or breast-feeding. 3. Subjects must not be receiving medications that affect blood coagulation. 4. Subjects must not have an allergy to contrast medium or renal failure that could be exacerbated by the contrast agent used in MRIs. For this study, renal insufficiency will be determined through blood work and defined as BUN of 30 or less and Creatinine of 1.5 or less. 5. Subjects may not have a hemoglobin A1c level above 8.0 mg/dl at time of implant. 6. Subjects may not have any implanted medical devices that are not cleared for MRI. 7. Subjects with a T-Score higher than 63 on the 18-question Brief Symptoms Inventory (BSI-18) who have undergone discussions with and been deemed unsuitable by the Principal Investigator, a study physician, and a psychologist 8. Subjects may not have a cardiac pacemaker. 9. Subjects may not have a cardioverter defibrillator. 10. Subjects may not be currently receiving diathermy therapy. 11. Subjects may not have an implanted infusion pump. 12. Subjects may not be immunosuppressed or currently receiving immunosuppressive medications. 13. Subjects may not have a profession (e.g. radiology technologist) or medical condition (e.g. remissory cancer involved regular follow-up x-rays) that would increase radiation exposure in the 12 months prior to starting or after ending participation in the study.