Abstract:Objective: The purpose of this study was to assess the effects?of?ozone alone and in combination with pulsed radiofrequency (PRF) in the treatment of postherpetic neuralgia (PHN) Methods: One hundred and thirty-seven patients with PHN were assigned into two groups: combination therapy with PRF and ozone (Group A, n = 78) and?ozone?therapy alone (Group B, n = 59). In Group A, the PRF was applied to the target dorsal root ganglions (DRGs). Then the ozonated water (11.5 μg/mL) was injected through the inner cannula. In group B, only the ozonated water was injected.The therapeutic efficacy was evaluated via visual analog scale (VAS) and tactile sensation at pre-treatment, post-treatment, 1 months, 3 months, and 6 months. Results: Compared with pre-treatment, the VAS was significantly decreased, in both group at different time points. Compared with group B, the VAS was significantly decreased, at 1 months, 3 months, and 6 months in group A (P<0.05).The total efficacy rate was significantly lower in group B than in group A at 1 months, 3 months(P<0.05).Similarly, the tactile sensation was also significantly decreased at post-treatment when compared to pre-treatment (P<0.05).However, there were no statistical differences between two groups. Regression analysis showed the history of diabetes mellitus and course of diseases had significant negative effects on the treatment results.Conclusion: The administration of PRF + ozone and ozone therapy alone both improved pain?symptoms. Moreover, treatment effects and total efficacy rates tended to be higher for the combination?of PRF and ozone compared with ozone?monotherapy.