QST and Neuropathic Pain

Inclusion Criteria:• Male and female patients between the age of 18-80 years who have a lumbar radiculopathy who have not undergone any spinal surgery. * Minimum baseline pain rating of 50mm on a 100mm NRS in the painful area * Chronic pain of at least 6 months * Subject satisfies standard criteria in the study centre for SCS implantation and the NICE 159 criteria for management of intractable neuropathic pain. * Subject satisfies standard criteria in the study centre for ONS implantation and the NICE 452 criteria for intractable chronic migraine. * Patients who have given their written informed consent. * Patient is able and willing to comply with study procedures and follow up schedule. Exclusion Criteria:• Any inclusion criteria not met * Female patients of childbearing age who is or plans on becoming pregnant during the course of the study * Patients who have undergone radiofrequency or injection therapy at or on a target neural structure (DRG) during the past 90 days * Patients with diabetes or any underlying neurological condition. * Patients known to have a condition that in the investigator's judgment precludes participation in the study. * Patients who have received an investigational drug or have used an investigational device in the 30 days preceding to study entry