A High Frequency Spinal Cord Stimulation PET-CT Scan Study

Inclusion Criteria: * Patients with intractable lumbar neuropathic pain who are due to receive Percutaneous Spinal Cord Stimulation as part of their standard treatment per NICE HTA guidance 159 at Barts Health NHS Hospitals. * Patients between 18 and 75 years of age. * Patients who have given their written informed consent. * Female patients of childbearing potential must be using adequate contraception (i.e. using oral or IM contraception or an IUCD) and must have a negative urine pregnancy test. * Patients must be able to communicate in English in order to complete validated questionnaires written in English only. Exclusion Criteria: * Patients with diabetes or any underlying neurological condition. * Patients known to have a condition that in the investigator's judgement precludes participation in the study. * Patients who have received an investigational drug or have used an investigational device in the 30 days preceding study entry. * Patients unable to comply with the study assessments and to complete the questionnaires.