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No.To my knowledge, apart from anatomical variations, there is no multifidus innervated by the L5 MB. The normal response would be no twitch, with root stimulation being a sign that the nerve root itself is being stim'd, meaning the needle is too ventral.
I get L5 DPR stim on occasion, and it’s exclusively buttock and those pts have zero leg stimulation with normal ablation outcomes. No L5 or S1 nerve root involvement.