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NRS score for lumbar facet joint-origin pain over the assessment period. (A) Mean NRS scores of all recruited patients. The mean NRS scores at 1, 2 and 3 months after intra-articular lumbar facet joint corticosteroid injection. (B) Changes in the mean NRS in each group at 1, 2 and 3 months after intra-articular lumbar facet joint corticosteroid injection. NRS, numerical rating scale. *P<0.001 vs. pre treatment.
