Background: Pain control is needed during radiofrequency ablation in musculoskeletal tumor. The effect of radiofrequency ablation can be modulated by lidocaine injection. Purpose: To evaluate the effects of injectable electrodes with intralesional lidocaine injection and compare its ablation performance with that of non-injectable electrodes in ex vivo pork sirloin. Material and Methods: Five specimen groups were used to investigate the effects of fluid injection before radiofrequency ablation using injectable and non-injectable electrodes: three injectable electrode comparison groups with 2% lidocaine (group A); 1% lidocaine (group B); 0.9% sodium chloride (group C); injectable electrode reference group without fluid (group D); and non-injectable electrode control group (group E). The injectable and non-injectable electrodes were 17-gauge electrodes each having a 1-cm active tip. Technical parameters, ablation size, and volumes were compared between the five groups. Results: Mean energies and currents during radiofrequency ablation were significantly lower for the four injectable electrode groups compared to group E (all P < 0.005). Two transverse diameters, vertical diameter, and volumes in the four injectable electrode groups were significantly smaller than those in group E (all P < 0.05). Among the injectable electrode groups, volumes and two transverse diameters were significantly smaller in group A than in group D (all P < 0.05). Conclusions: A slightly smaller ablation zone is obtained when lidocaine injection is performed before radiofrequency ablation using an injectable electrode compared to a non-injectable electrode.
- Radiofrequency ablation
- ex vivo
- injectable internally cooled electrode