Impact of the SCS With Different Waveforms Over the Quality of Life (SCS-Quality)

Inclusion Criteria: * Leg with/without Low back pain with neuropathic characteristics (VAS ≥ 5 and DN4≥4) during at least 6 months before the screening consultation. * Stable medical therapy with Evidence Based Medicine (EBM) during at least one month before the screening * Ready and able to accomplish the procedures of the study and use the activity monitor and the medication diary. * Have 18 years old or older when the patient signs the informed consent * Pain kept during at least the last 6 months with VAS ≥ 6 and functional limitation due to the pain * Refractory to treatment (during at least 3 months), and/or * Intolerable adverse effects that avoid an optimum medical treatment * Previous lumbosacral surgery for treatment of the cause of his pain * Pain attributable to a low back pathology Exclusion Criteria: * Pregnant or with planned pregnancy * Life expectancy \<1 year. * Polyneuropathy. * Important Heart disease or peripheral vascular disease * Degenerative disease that can decrease the functional capacity * Alcoholism - Drug abuse * Active infection * Oncological active disease * Haematological disorder with increased bleeding risk * Patient unable to understand / follow the target of the study and the work flow * When trial period has finished, the negative clinical response will be considered an exclusion criterion. The treatment could be completed, and the data collected but the patient will be excluded of the Randomized Clinical Trial (RCT) and the data analysed separately.