The Pain Suppressive Effect of Alternative Spinal Cord Stimulation Frequencies

Inclusion Criteria: * Male/female, 18 years to 70 years * Chronic, persistent, refractory, unilateral neuropathic limb pain, as a result of spinal surgery * Failed conservative treatments for chronic pain including but not limited to pharmacological therapy, physical therapy and minimally interventional pain procedures for chronic pain * Pain radiating in the leg, following segments L4 and/or L5 and/or S1 for at least 6 months * Minimum baseline pain intensity as assessed by VAS of ≥ 50mm on 100mm scale in the primary pain area * Subject is able and willing to provide informed consent * Subject is able and willing to comply with the protocol and follow-up schedule * Subject has been included for implantation according to standard criteria from the Dutch Neuromodulation Society Exclusion Criteria: * Back pain component of more than 20% or VAS \> 40mm on 100mm scale * Bilateral limb pain * Subjects with a previous SCS implantation. * Changes in pain medication in the 2 months preceding the trial period; * Expected inability of subjects to correctly operate the neurostimulation system * Presence of any other clinically significant or disabling chronic pain condition -eg. hip arthrosis, rheumatoid arthritis, fibromyalgia, etc. * History of coagulation disorders, lupus erythematosus, diabetes mellitus, or morbus Bechterew * Symptoms or proof of any malignant disease * Current use of medicines affecting coagulation which cannot be temporarily stopped * Evidence of an active disruptive psychiatric disorder or other known condition significant enough to impact the perception of pain, compliance to intervention and/or ability to evaluate treatment outcome as determined by the investigator * Life expectancy of less than 1 year * Existing or planned pregnancy in the trial period * BMI \>20 and \<35 - a minimum and maximum BMI limit are imposed due to the technical difficulties and risk of complications in underweight or morbidly obese subjects.