• Evert J Buijs, Roelof M A W van Wijk, Jos W M Geurts, Rolf R Weeseman, Robert J Stolker, and Gerbrand G Groen.
• Centre for Perioperative Medicine, Anesthesiology, and Pain Clinic, University Medical Centre Utrecht, Utrecht, The Netherlands. ejbuijs@kabelfoon.nl
• Reg Anesth Pain Med. 2004 Sep 1; 29 (5): 400-7.

Background And ObjectivesRadiofrequency facet denervation procedures are widely used for the treatment of chronic low-back pain. Currently, both temperature-controlled and voltage-controlled techniques are used. In this combined in vivo and in vitro study, the electrophysiologic consequences and the effects on lesion size of these techniques were determined.MethodsThirty-three patients were randomly assigned to receive a lumbar radiofrequency facet denervation by using either temperature-controlled (80 degrees C, 60 seconds) or voltage-controlled (20 V, 60 s) mode. Electrophysiologic parameters in both groups during radiofrequency lesioning were registered. Observed differences between electrodes were quantified and interpreted, using lesion-size data from egg-white experiments.ResultsSeventeen patients in the temperature group were treated with a total of 55 radiofrequency lesions, all considered technically adequate. In the voltage-controlled group, 16 patients received 63 lesions. Of these, 44 (69.8%) procedures were found to be technically inadequate. Voltage-controlled radiofrequency lesioning resulted in uncontrollable fluctuations of temperature, with resultant uncontrollable variations in lesion size. Temperature-controlled mode created reproducible lesion sizes.ConclusionsThere is no consistent relation between voltage and the temperature obtained during radiofrequency lumbar facet denervation. Temperature-controlled radiofrequency lesioning is preferred to create reproducible lesion sizes.

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