The aim of the study is to show that subcutaneous electric lumbar stimulation reduces pain in chronic lumbago after 12 months of treatment.

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.