Placebo Effect In Spinal Cord Electrical Stimulation for Pain

Inclusion Criteria: * History consistent with PSPS2 of at least 6 months after the last spinal surgery. The patient experienced no effect of conservative treatments and has been assessed as not eligible for further spinal surgery. * Patients between 18-70 years of age. * Average perceived pain intensity in one or both legs of 5 or more and average perceived pain intensity in the back of less than 3 measured with the validated 11-box NRS (0 no pain, 10 worst imaginable pain) * The patient should have been informed verbally and in writing about the study and should have provided informed written consent to participate. * Adequate pain relief effect (50% or more) after a two week trial with active test stimulation. Exclusion Criteria: * Subject is unable to understand or operate the SCS device. * Subject currently has an active implantable device including pacemakers, spinal cord stimulator or intrathecal drug delivery system. * Ongoing coagulation disorder. * Ongoing abuse of alcohol, drugs, or prescription opioids. * Active debilitating psychiatric illness. * Active malignancy. * Condition with increased general infection sensitivity, such as known immunodeficiency. * Expected lifespan \<1 year. * Ongoing local infection or other skin disease where the IPG is planned to be placed. * Pregnancy.