title: Comparison between bipolar pulsed radiofrequency and monopolar pulsed radiofrequency in chronic lumbosacral radicular pain: A randomized controlled trial.
abstract: BACKGROUND
  Chronic lumbosacral radicular pain is a challenging medical problem with respect to therapeutic management. Many patients with lumbosacral radicular pain complain of persistent leg pain after transforaminal epidural steroid injection. Nowadays, pulsed radiofrequency (PRF) stimulation on the dorsal root ganglion (DRG) is widely used for controlling lumbosacral radicular pain.
  
  
  METHODS
  We evaluated the effect of bipolar PRF on the DRG for the management of lumbosacral radicular pain. In addition, we compared the effect of bipolar PRF to monopolar PRF. Fifty patients with chronic lumbosacral radicular pain were included in the study and randomly assigned to 1 of 2 groups, the bipolar or monopolar PRF group (n = 25 per group). Pain intensity was evaluated using a numeric rating scale (NRS) at pretreatment, and 1, 2, and 3 months after treatment.
  
  
  RESULTS
  When compared to the pretreatment NRS scores, patients in both groups showed a significant decrease in NRS scores at 1, 2, and 3 months after treatment. Reductions in the NRS scores over time were significantly larger in the bipolar PRF group. Three months after treatment, 19 patients (76.0%) in the bipolar PRF group and 12 patients (48.0%) in the monopolar PRF group reported successful pain relief (pain relief of ≥50%).
  
  
  CONCLUSIONS
  The use of bipolar PRF on the DRG can be an effective and safe interventional technique for chronic refractory lumbosacral radiculopathy, particularly in patients whose pain are refractory to epidural steroid injection or monopolar PRF stimulation.
authors.affiliation: Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University Dr Ahn's Spine & Pain Clinic, and Dr Ahn's Spine and Pain Institute, Taegu, Republic of Korea.
authors.forename: Min Cheol
authors.initials: MC
authors.lastname: Chang
authors.forename: Yun Woo
authors.initials: YW
authors.lastname: Cho
authors.forename: Sang Ho
authors.initials: SH
authors.lastname: Ahn
mesh_terms: D000328:Adult; D000368:Aged; D059350:Chronic Pain / Q000628:therapy*; D005260:Female; D005727:Ganglia, Spinal; D006801:Humans; D017116:Low Back Pain / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D061208:Pulsed Radiofrequency Treatment