Evaluation of the Benefit and Safety of Localized Tissue Hydration in the Management of Chronic Low Back Pain

Inclusion Criteria: * Patient 18 years of age or older ; * Patient with chronic, non-operated low-back pain operated for more than 3 months (verbal numerical scale ≥ 5); * Chronic common lumbago not requiring surgical management surgical ; * Lumbar MRI performed as part of routine care and available available for the inclusion visit; * For women of childbearing age, use of a highly effective contraceptive method; * Patient affiliated to a French health insurance scheme; * Patient has signed an informed consent form. Exclusion Criteria: * Pregnant or breast-feeding woman; * Patient in accident at work ; * Patient with radicular syndrome; * Contraindication to magnetic resonance imaging or CT scan; * Severe cases of hydric inflation and hydrosodic retention, particularly in cases of : * Decompensated heart failure; * Acute renal failure with oliguria or anuria; * Decompensated liver failure; * Pre-eclampsia/eclampsia. * Hypochloremia ; * Hypernatremia ; * Patients of legal age subject to legal protection, guardianship, curatorship or deprived of liberty by judicial or administrative decision; * Patient hospitalized without consent; * Patient unable to answer a questionnaire; * Patients who do not understand or speak French. Exclusion period for inclusion in another study : Included patients will not be allowed to participate in another interventional study during the entire follow-up period. The exclusion period is 8.5 months.