Background: We previously reported on a combined technique and initial data of hip denervation using an anterior approach and cooled radiofrequency.
Objectives: A large retrospective study to evaluate the long-term effectiveness of cooled radiofrequency ablation (CRFA) in the general chronic hip pain population.
Study Design: Retrospective electronic chart review.
Setting: A single specialty private practice.
Methods: Retrospective chart review of 235 consecutive (CRFA) in 136 patients with chronic hip pain.
Results: Out of 235 CRFA, 178 (96 initial procedures and 82 repeats) were performed in 84 patients with 12 or more months follow-up. The average decrease in visual analog scale (VAS) pain scores was 7.3 ± 1.3 to 2.3 ± 1.5 and 2.48 ± 1.5 for the first and second diagnostic block, respectively, and was statistically significant (P < 0.001). Similarly, the average decrease in VAS pain scores at 6 and 12 months after CRFA denervation was 3.44 ± 2.5 and 4.23 ± 2.5, respectively; P < 0.001. Out of the 96 initial procedures in 84 patients, 66 procedures (69%) provided more than 50% relief at 6 months, and 50 (52%) at 12 months. There were 82 repeat denervations in 36 patients. Repeated procedures in the same patients provided a similar degree of pain relief with no statistically significant difference in the median pain scores (2.8 ± 2.1 cm vs 3.1 ± 1.7 cm ; P = 0.197) or time interval of pain relief (12.7 ± 10.9 vs 10.3 ± 4.7; P = 0.508). There were 3 minor complications.
Limitations: Retrospective nature of the study.
Conclusion: Improvements in pain scores and longevity of pain relief from chronic hip pain using a simple, anterior approach to radiofrequency denervation of the lateral obturator and lateral femoral nerves justifies further randomized prospective trials. Repeated CRFAs demonstrated consistency in pain relief and absolute safety of repeated denervation.
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