Multifidus Muscle Twitch on the Prognosis of Lumbar Medial Branch RF

In above L5, The RF needle was placed to contact with bone as close as possible to the course of the target nerve in parallel. For L5 dorsal rami ablation, the needle was positioned in the groove between the S1 articular process and sacral ala. At each level, the electrodes were adjusted to optimize sensory stimulation at a frequency of 50 Hz and maximize multifidus contraction at 2 Hz. A 75 second 80°C lesion was made using an RF generator.