Assessment of the Efficacy of an Intradiscal Injection of Corticoids in Modic I Discopathies.

Inclusion Criteria: * Age between 18 and 80 years * Signed Informed consent * Low back pain for more than 6 months associated with Modic I discopathy (diagnosed by MRI) Exclusion Criteria: * Past history of lumbar surgery * Patient under anticoagulant or antisludge treatment, or with coagulation troubles * Patient with unbalanced diabetes mellitus (blood glucose \> 1.30 g/l) * Patient with unstabilized high blood pressure (\> 160/95 mmHg) * Patient with evolving infection * Patient with iodine allergy or one of the Hydrocortancyl® or Lidocaine components * Porphyria, hypersensitivity to local anaesthetic * Patient with sphincter troubles showing a cauda equine syndrome * Untreated psychotic state * Pregnant women or of childbearing age without effective contraception means * Impossible 6 months follow-up * Participation to another trial * Vulnerable persons protected by the law * Persons under guardianship * Persons unable to express their consent