Ultrasound-guided Lumbar Periradicular Injection: a Non Irradiating Infiltration Technique

Inclusion Criteria: * neurology, neurosurgery, physical medicine, algology consultation * over the age of 18 * Radiculalgia in the territory corresponding to the root lesion * Symptomatology inferior to two months. * Imaging (CT scan or MRI) or electromyographic study with evidence (foraminal disc herniation or foraminal stenosis) of the irritation or the causal compression of the radicular symptomatology Exclusion Criteria: * allergy to any of the constituents of the infiltrated product, or to the contrast medium * unstable medical condition: cardiac, respiratory, endocrine (uncontrolled diabetes) * inability to put himself in a prone position * depression: HADS score equal to or greater than 11. * root lesion caused by an accident at work, a tumoral or infectious causal process. * local infection (cutaneous, perimedullary / spinal) or systemic * coagulopathy (platelets \<50000 / mm3, Prothrombin time \<60%, INTernational normalized ratio\> 1.5), anticoagulant or antiplatelet therapy treatment other than aspirin * Lumbar surgical history * history of foraminal or perimedullary infiltration of less than 6 months * symptoms older than two months * pregnant woman