Impact of Subcutaneous Electric Lumbar Stimulation on Treatment of Refractory Chronic and Disabling Lumbago

Inclusion Criteria: * patients over 18 years old * Having given their non-opposition * Affiliated to a national insurance scheme or beneficiary * Suffering for more than a year from a chronic, invalidating lumbago that is refractory in several lines of treatments Exclusion Criteria: * patients with lumbago that can be surgically handled or which justified a medullary stimulation * having been operated for the rachis for less than 6 months; * which cannot for cognitive or cultural reasons contribute to the planned evaluations and to the management of the material (remote control); * for who the investigator can plan that they cannot be followed during one year from the date of the setting-up (non-observance, planned moving, etc.); * which present psychological, local or general contraindications to the setting-up of a neurostimulation device (Impossibility to stop anticoagulants or aggregation inhibitors, disturb of the hemostasis, cutaneous infection change on the site of setting-up) * MRI planned within the next year * pregnant or breast-feeding women.