Abstract
Radiofrequency (RF) lesions have been used for over 25 years in the treatment of intractable pain of spinal origin. The conventional understanding of this technique is that the heat which is produced in the tissue surrounding the electrode tip causes destruction of nervous tissue, which in turn reduces the input of noxious nerve stimuli and alleviates pain. Neuropathic pain is usually a contra-indication to the use of RF nerve lesioning. For treatment of patients with severe radicular pain we use pulsed radiofrequency who has been recently described as a technique to apply a relatively high voltage near a nerve but without the usual effects of rise in temperature or subsequent nerve injury.
This study reports the effect of pulsed RF in 21 patients with severe radicular pain who had previously failed to respond to conventional therapy.
Patients and Methods: From December 2000 to August 2001, 18 patients underwent pulsed RF Rhizotomy of Dorsal Root Ganglion (DRG) of segmental N. Root of the painful dermatome. Out of them, 16 passed treatment in the lumbar area and 2 in the neck. The age of the patients ranged from 20 to 75 years (m=55.7 years). Male/female ratio was 1.4/1. 50% was previously operated (discectomy, laminectomy). No complications were seen either in the procedure or in the follow-up.
Results: Out of 21 patients, 3 (14.3%) did not respond to treatment. In the remaining 18 patients Rhizotomy was successful at 3 months follow-up. Mean VAS score before procedures was 8.85 (range 7–10), after treatment 3.8 (range 0–10).
Conclusion: Pulsed RF treatment is a safe, simple procedure to control radicular, neuropathic pain in the cervical, thoracic and lumbar regions. Advantages of this method:
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It is non-destructive procedure and it can therefore be used for different indication which were not suitable for conventional RF.
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Post-procedure discomfort does occur but it is less pronounced than following conventional RF.
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Although permanent sensory loss is a rare complication of RF it does occur. Pulsed RF does not have this complication.
The abstracts were prepared by Orah Naor. Correspondence should be addressed to him at the Israel Orthopaedic Association, PO Box 7845, Haifa 31074, Israel.
