In adults with chronic low back pain, the investigators will compare the effectiveness of the medial bundle branch block on three lumbar levels (L3-L4, L4-L5 and L5-S1) performed either by radiographic guidance or by ultrasound approach according to a transverse approach. The objective of this study will be to evaluate the benefit of these both procedures on pain, on the practice of daily activities and the incidence of adverse events in order to show whether the two modalities are equivalent.
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Oswestry Disability Index (ODI) score
Timeframe: 1 month