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According to Japanese Meiji University of Integrative Medicine research.

"Both injection and acupuncture relieved pain, but acupuncture was superior for the immediate and sustained effects, suggesting that it is a useful treatment for low back pain. The difference in the effects may be attributable to differences in the mechanism of pain suppression."

Because they found that was a significant difference between the two groups ( Acupuncture and injection group) in the change in Visual Analogue Scale pain scores (p<0.01), with acupuncture providing more favourable results than local anaesthetic injection. The reduction in pain score from baseline calculated at each time period was significantly different between the two groups after the first (p<0.05) and final (p<0.01) treatments, and during the follow-up period (after 2 weeks (p<0.01) and 4 weeks (p<0.05)).