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Original Article

The Korean Journal of Pain 2019; 32(4): 280-285

Published online October 1, 2019 https://doi.org/10.3344/kjp.2019.32.4.280

Copyright © The Korean Pain Society.

The effect of needle tip position on the analgesic efficacy of pulsed radiofrequency treatment in patients with chronic lumbar radicular pain: a retrospective observational study

Won-Joong Kim1 , Hahck Soo Park2 , and Min Ki Park1

1Department of Anesthesiology and Pain Medicine, Ewha Womans University Mokdong Hospital, School of Medicine, Ewha Womans University, Seoul, Korea
2Department of Anesthesiology and Pain Medicine, Ewha Womans University Seoul Hospital, School of Medicine, Ewha Womans University, Seoul, Korea

Correspondence to:Won-Joong Kim
Department of Anesthesiology and Pain Medicine, Ewha Womans University Mokdong Hospital, School of Medicine, Ewha Womans University, 1071 Anyangcheon-ro, Yangcheon-gu, Seoul 07985, Korea
Tel: +82-2-2650-2689
Fax: +82-2-2655-2924
E-mail: ickypoo@naver.com

Received: March 12, 2019; Revised: August 15, 2019; Accepted: August 18, 2019

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background

Pulsed radiofrequency (PRF) is a treatment modality that alleviates radicular pain by intermittently applying high-frequency currents adjacent to the dorsal root ganglion. There has been no comparative study on analgesic effect according to the position of the needle tip in PRF treatment. The objective of this study is to evaluate the clinical outcomes of PRF according to the needle tip position.

Methods

Patients were classified into 2 groups (group IP [group inside of pedicle] and group OP [group outside of pedicle]) based on needle tip position in the anteroposterior view of fluoroscopy. In the anteroposterior view, the needle tip was advanced medially further than the lateral aspect of the corresponding pedicle in group IP; however, in group OP, the needle tip was not advanced. The treatment outcomes and pain scores were evaluated at 4, 8, and 12 weeks after applying PRF.

Results

At 4, 8, and 12 weeks, there were no significant differences between the successful response rate and numerical rating scale score ratio.

Conclusions

The analgesic efficacy of PRF treatment did not differ with the needle tip position.

Keywords: Analgesics, Ganglia, Spinal, Low Back Pain, Lumbosacral Region, Needles, Pulsed Radiofrequency Treatment, Radiculopathy, Spinal Nerve Roots