Inclusion Criteria:  Patients with chronic neuropathic lower extremity pain, without back pain, who have consented to undergo or are undergoing spinal cord stimulation (SCS) Age 22 to 70 Fluent in English and able to independently provide consent Patients treated with conventional SCS for at least 3 months prior to commencement of study, either newly implanted or already implanted. Patients have pronounced pain, i.e. visual analog scale score (VAS) ≥6 and respond to conventional SCS, i.e. VAS reduction of at least 50% with SCS.  Exclusion Criteria:  Significant psychiatric problems, including unrelated clinically significant depression as determined by the investigator. Current drug or alcohol abuse as determined by the investigator. Any history of recurrent or unprovoked seizures. Any significant medical condition that is likely to interfere with study procedures or likely to confound evaluation of study endpoints, including any terminal illness with survival <12 months. Females who are pregnant, breastfeeding, or are of childbearing potential and planning to get pregnant during the course of the study or not using adequate contraception On anticoagulation therapy