OBJECTIVE: To evaluate the effectiveness of osteopathic manipulative treatment (OMT) associated with transcranial direct current stimulation (tDCS) in reducing pain, disability, and improving quality of life in participants with non-specific chronic low back pain. DESIGN: A randomised double-blind clinical trial. SETTING: Clinical outpatient unit. SUBJECTS: 72 participants with non-specific chronic low back pain were randomised into three groups: active tDCS plus OMT (n = 24), sham tDCS plus sham OMT (n = 24), and sham tDCS plus OMT (n = 24). INTERVENTIONS: Evaluations were performed before, after the intervention, and one month post-intervention. tDCS consisted of ten 20-minute sessions over two weeks (five sessions per week). OMT was administered once per week, with two sessions conducted before the first and sixth tDCS sessions. MAIN MEASURES: Pain, disability, and quality of life were assessed at baseline, after two weeks, and at one month of follow-up. RESULTS: The visual analogue scale showed a significant decrease in all groups (p < 0.001). However, tDCS plus OMT and sham tDCS plus OMT demonstrated a clinically significant reduction compared to the sham combination (effect size n2 = 0.315). Roland-Morris scores decreased across all groups without specific group effects. EuroQoL 5-Dimension 3-Level improvement was observed only in the tDCS plus OMT and sham tDCS plus OMT groups (significant difference between T2 and T0, p = 0.002). CONCLUSION: The combination of OMT and tDCS did not provide clinically significant improvement over OMT alone in participants with non-specific chronic low back pain.

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