• Journal of Korean Neurosurgical Society
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• 제41권1호
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• pp.27-29
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• 2007

Objective : Surgical treatment of focal plantar hyperhidrosis is often unsatisfactory compared to palmar hyperhidrosis. The purpose of this study is to evaluate the effect of lumbar sympathetic radiofrequency neurotomy on plantar hyperhidrosis. Methods : From February 2004 to December 2005, 10 patients [mean age 24.3 male 1, female 9] with the clinical diagnosis of plantar hyperhidrosis were treated by bilateral lumbar sympathetic radiofrequency neurotomy of L3 and L4. Patients' symptom relief, satisfactory rate and side effects related to the procedure were analyzed. Results : Radiofrequency neurotomy was effective in the treatment of focal plantar hyperhidrosis showing excellent [more than 75% improved] outcome in 70% of the patients and good [more than 50% improved] in 30%. Complications related to the surgical procedure, such as sensory dysesthesia and compensatory hyperhidrosis were not detected in any case. Conclusion : The use of radiofrequency neurotomy to ablate the lumbar sympathetic ganglion is a safe and effective treatment option for patients with plantar hyperhidrosis.

• The Korean Journal of Pain
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• 제18권2호
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• pp.151-155
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• 2005

Background: A significant number of patients complain of persistent pain or neurologic symptoms after lower back surgery. It is reported that facet joint pain plays a role in failed back surgery syndrome. To the best of our knowledge, there are few studies that have investigated the outcome of radiofrequency neurotomy in the patients with failed back surgery syndrome. Methods: The study group was composed of thirteen patients who were operated on due to their low back pain, and they displayed no postoperative improvement. All the patients underwent double diagnostic block of the lumbar medial branch of the dorsal rami with using 0.5% bupivacaine. The patients who revealed a positive response to the double diagnostic block were then treated with percutaneous radiofrequency neurotomy. The effect on their pain was evaluated with using a 4 point Likert scale. Results: Eleven patients revealed a positive response to the double diagnostic block. Ten patients were given percutaneous radiofrequency neurotomy. Nine patients showed sustained pain relief for 3 months after the percutaneous radiofrequency neurotomy. Conclusions: We found lumbar facet joint syndrome in the patients with failed back surgery syndrome by performing double diagnostic block and achieving pain relief during the short term follow-up after percutaneous radiofrequency neurotomy of the lumbar zygapophysial joints. This suggested that facet joint pain should be included in failed back surgery syndrome.

• Journal of Korean Neurosurgical Society
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• 제40권2호
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• pp.95-98
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• 2006

Objective : The aim of this study is to evaluate the feasibility, safety and effectiveness of radiofrequency neurotomy[RFN] for remnant pain after vertebroplasty for the treatment of severe compression fracture. Methods : 25 patients with remnant pain after vertebroplasty for one level severe compression fracture were treated by RFN. The severe compression fractures were defined to the vertebrae which less than 50% of their original heights have collapsed. Pain relief was evaluated at 2 weeks, 6 weeks and 3 months after the procedure using a visual analog scale[VAS]. Results : Successful outcome was determined if pain reduction exceeded 50% on the VAS at 6 weeks. Six of the 25 patients did not respond favorably to RFN [pain reduction less than 50%], and nineteen patients showed successful responses. Mean VAS score was decreased from 5.48 to 2.96 at 6 weeks. Conclusion : The radiofrequency neurotomy may be both feasible and useful treatment for the remnant pain after vertebroplasty. However long-term follow up is needed to confirm the effectiveness.

• Journal of Korean Neurosurgical Society
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• 제48권3호
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• pp.240-243
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• 2010

Objective : Radiofrequency (RF) medial branch neurotomy is an effective management of lumbar facet syndrome. However, pain may recur after period of time. When pain recurs, it can be repeated, but the successful outcome and duration of relief from repeated procedures are not clearly known. The objective of this study was to determine the success rate and duration of pain relief from repeated radiofrequency medial branch neurotomy for lumbar facet syndrome. Methods : A retrospective review of medical records was done on 60 consecutive patients, from March of 2006 to February of 2009, who had an initial successful RF neurotomy but subsequently underwent repeated procedures due to recurrence of pain. All procedures were done in carefully selected patients after at least two responsive medial branch nerve blocks. C-arm fluoroscopic guide, impedance, sensory and motor threshold monitoring tools were used for the precise placement of electrodes. Responses of repeated procedures were compared with initial radiofrequency neurotomy for success rates and duration of pain relief. Results : There were 48 females and 12 males. Mean age was 52.4 years (range, 26-83). RF medial branch neurotomy was done on one side in 38 and both sides in 22 patients, each covering at least three segments. Average visual analog scale at last procedure was 6.8. Twelve patients had previous lumbar operations, including 4 patients with instrumentations. Fifty-five patients had two procedures and five patients had three procedures. Mean duration of successful pain relief (> 50% of previous pain for at least 3 months period) after initial radiofrequency neurotomy was 10.9 months (range, 3-28) in 51 (85%) patients. From repeated procedures, successful pain relief was seen in 50 (91%) patients with average duration of 10.2 months (range, 3-24). Five patients had third procedure, which was successful in 4 (80%) patients with mean duration of 9.8 months (range, 5-16). This was not statistically different from initial results. There were no permanent neurological complications from the procedures. Conclusion : Results of this study indicate that the frequency of success and durations of relief from repeated RF medial branch neurotomy for lumbar facet syndrome are similar to initial results that provided relatively prolonged period of pain relief without major side effects Each procedure seems to provide successful pain relief for about 10 months in more than 85% of carefully selected patients when properly done.

• The Korean Journal of Pain
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• 제19권2호
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• pp.257-260
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• 2006

Radiofrequency neurotomy of the lumbar medial branch, via a caudal approach, is a representative interventional procedure for lumbar zygapophysial joint pain, which can be performed more accurately and easily using a guide needle technique. We experienced a case of burn wound formation along the guide needle trajectory, where heat conduction through the guide needle was suggested to have resulted in the burn wound.

• The Korean Journal of Pain
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• 제13권2호
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• pp.242-246
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• 2000

Radiofrequency medial branch neurotomy is an effective way of controlling pain in the posterior compartment of the spine such as the facet joint, and the interspinous ligament. However, it is difficult to determine the exact location of the medial branch. Up until now we have relied on sensory response provoked by 50 Hz stimulation. The responses elicited using this method are quite subjective and can originate from sources other than the medial branch such as the periosteum, the intermediate or lateral branch. We need a confirmed indicator to locate the medial branch reliably. We applied 2 Hz stimulation under 0.4 volts to locate the medial branch and elicited a motor response. Twitching of multifidus and muscles around the SI joint was observed. The observation of these muscles provides a much more reliable method for confirmation of the medial branch. We have treated 45 chronic nonspecific low back pain patients using radiofrequency medial branch neurotomy with this method of confirming the medial branch.

• Journal of Korean Neurosurgical Society
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• 제50권6호
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• pp.507-511
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• 2011

Objective : Cervicogenic headache (CGH) is known to be mainly related with upper cervical problems. In this study, the effect of radiofrequency neurotomy (RFN) for lower cervical (C4-7) medial branches on CGH was evaluated. Methods : Eleven patients with neck pain and headache, who were treated with lower cervical RFN due to supposed lower cervical zygapophysial joint pain without symptomatic intervertebral disc problem or stenosis, were enrolled in this study. CGH was diagnosed according to the diagnostic criteria of the cervicogenic headache international study group. Visual analogue scale (VAS) score and degree of VAS improvement (VASi) (%) were checked for evaluation of the effect of lower cervical RFN on CGH. Results : The VAS score at 6 months after RFN was $2.7{\pm}1.3$, which were significantly decreased comparing to the VAS score before RFN, $8.1{\pm}1.1$ ($p$<0.001). The VASi at 6 months after RFN was $63.8{\pm}17.1%$. There was no serious complication. Conclusion : Our data suggest that lower cervical disorders can play a role in the genesis of headache in addition to the upper cervical disorders or independently.

• Journal of Korean Neurosurgical Society
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• 제38권6호
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• pp.442-444
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• 2005

Objective : There were few reports about statistically significant factor which contribute to low back pain[LBP] after microscopic discectomy. We analyzed the result of percutaneous radiofrequency neurotomy[PRN] for low back pain after microscopic discectomy in lumbar disc herniation. Methods : Forty four patients with LBP after microscopic discectomy who were treated by one level microscopic discectomy from January 2003 to March 2004 were included in this study. They were divided into two groups by the presence of preoperative LBP into preoperative back pain group [group I] and postoperative back pain group [group II]. Radiofrequency procedures were performed in the usual manner, targetting the medial branch of L4, L5 and Sl. Pain relief was estimated at 1 week, 1 month and 6 months following the procedure, using the visual analogue scale. Above 50% pain relief was defined as the positive response. Results : Positive responders were 16 patients [73%] at 1 week, 12 patients [55%] at 1 month, and 7 patients [32%] at 6 months after PRN in group I. In Group II, 18 patients, 15 patients and 13 patients responded positively after 1 week, 1 month and 6 months after PRN, respectively. Conclusion : PRN is an effective treatment for newly developed low back pain after microscopic discectomy. There was no morbidity in our series, but long-term follow up is necessary.

• Journal of Korean Neurosurgical Society
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• 제38권5호
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• pp.338-343
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• 2005

Objective : The sacroiliac joint complex is often related with functionally incapacitating pain in old aged people. The purpose of this study is to delineate the investigation strategies and to determine the long-term effect of radiofrequency [RF] neurotomies for pain arising from sacroiliac Joint dysfunction[SIJD]. Methods : Sixteen patients were diagnosed as having chronic pain from SIJD by comparative controlled blocks on L5 dorsal rami, sacroiliac Joints and deep interosseous ligaments. After confirming the positive response [more than 50% of pain relief], sensory stimulation was applied to detect the 'pathological' branches. Subsequently, RF neurotomies were performed on the selected nerve branches. Surgical outcome was graded as successful, moderate improvement, and failure after a 6month follow-up period. Results : Stimulation intensity was 0.45V to elicit pain response in the L5 dorsal rami and lateral sacral branches. The number of RF-lesioned nerve branches was 6per patient. The average number of lesions for each branch was 1.3. Most commonly selected branches were L5 dorsal ramus [88%] and S2-upper division [88%]. Ten patients [63%] reported a successful outcome according to the outcome criteria after 6months of follow-up, and five patients [31%] reported complete relief [100%]. Five patients [31%] showed moderate improvements. One patient reported failure. Conclusion : RF neurotomy of lateral sacral branches is an excellent treatment modality for the pain due to SIJD, provided that comparative controlled block shows a positive response.

• Journal of Korean Neurosurgical Society
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• 제41권1호
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• pp.7-10
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• 2007

Objective : The aim of this study was to determine the efficacy of percutaneous radiofrequency neurotomy[RFN] of ramus communicans nerve in patients suffering from severe low back pain due to osteoporotic compression fracture. Methods : Twenty two patients with lumbar osteoporotic compression fracture who had intractable back pain for less than two weeks and were performed with RFN at L1-L4 from May 2004 to December 2005 were retrospectively analyzed. Clinical outcome using visual analogue scale[VAS] pain scores and modified MacNab's grade was tabulated. Complications related to the procedure were assessed. Results : Twenty-two female patients [age from 63 to 81 years old] were included in this study. The mean VAS score prior to RFN was 7.8, it improved to 2.6 within postoperative time of 48 hours, and the mean VAS score after 3 months was 2.8, which was significantly decreased. Eighteen of 22 patients were graded as excellent and good according to modified MacNab's criteria at final follow up. All patients recovered uneventfully, and the neurologic examination revealed no deficits. Two patients showing poor results worsened in symptom. Percutaneous was performed eventually resulting in symptom improvement. There were no significant complications related to the procedure such as sensory dysesthesia, numbness or permanent motor weakness. Conclusion : RFN is safe and effective in treating the painful osteoporotic compression fracture. in patients with intractable back pain due to lumbar osteoporotic compression fracture, RFN of gray ramus communicans nerve should be considered as a treatment option prior to vertebroplasty.