title: A randomized, double-blind, prospective study comparing the efficacy of continuous versus pulsed radiofrequency in the treatment of lumbar facet syndrome.
abstract: OBJECTIVE
  To compare the efficacy of continuous radiofrequency (CRF) thermocoagulation with pulsed radiofrequency (PRF) in the treatment of lumbar facet syndrome.
  
  
  METHODS
  Prospective, randomized, double-blinded study.
  
  
  METHODS
  Ambulatory pain clinic at a level-I trauma center and teaching institution.
  
  
  METHODS
  50 ASA physical status I, II, and III patients, at least 18 years of age, scheduled to undergo CRF or PRF for lumbar back pain.
  
  
  METHODS
  Target facet joints were identified with oblique radiographic views. Continuous radiofrequency thermocoagulation was delivered at 80 degrees C for 75 seconds, while PRF was delivered at 42 degrees C with a pulse duration of 20 ms and pulse rate of two Hz for 120 seconds.
  
  
  METHODS
  Visual analog scale (VAS) pain assessment and Oswestry Low Back Pain and Disability Questionnaire (OSW) were administered at baseline and then at three months. Comparisons between groups and within groups were made of the relative percentage improvement in VAS and OSW scores.
  
  
  RESULTS
  No significant differences in the relative percentage improvement were noted between groups in either VAS (P = 0.46) or OSW scores (P = 0.35). Within the PRF group, comparisons of the relative change over time for both VAS (P = 0.21) and OSW scores (P = 0.61) were not significant. However, within the CRF group, VAS (P = 0.02) and OSW scores (P = 0.03) showed significant improvement.
  
  
  CONCLUSIONS
  Although there was no significant difference between CRF and PRF therapy in long-term outcome in the treatment of lumbar facet syndrome, there was a greater improvement over time noted within the CRF group.
authors.affiliation: Department of Anesthesia K-4, Henry Ford Hospital, Detroit, MI 48202, USA. hkroll@hfhs.org
authors.forename: Henry R
authors.initials: HR
authors.lastname: Kroll
authors.forename: David
authors.initials: D
authors.lastname: Kim
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Danic
authors.forename: Steadman S
authors.initials: SS
authors.lastname: Sankey
authors.forename: Monish
authors.initials: M
authors.lastname: Gariwala
authors.forename: Morris
authors.initials: M
authors.lastname: Brown
mesh_terms: D017115:Catheter Ablation / Q000379:methods*; D004311:Double-Blind Method; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D017116:Low Back Pain / Q000209:etiology / Q000601:surgery*; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D017060:Patient Satisfaction; D011446:Prospective Studies; D013577:Syndrome; D016896:Treatment Outcome; D021801:Zygapophyseal Joint / Q000294:innervation / Q000601:surgery*