[Long-term results following percutaneous facet coagulation]

93 patients with a mean follow up of 73 months (30-133 months) after lumbar percutaneous radiofrequency denervation (PRFD) were evaluated. Mean age of the patients at time of surgery was 47 years (18-76 years). 54 patients had no lumbar spine surgery prior to facet denervation, 32 patients had one or multiple disc surgery prior to denervation, and 7 patients had spinal fusions. 51 patients were in the process of early retirement or already retired at time of surgery. Out of all 93 patients only 50% had significant pain relief immediately after PRFD. 3 months after PRFD the success rate dropped down to 38%. 6 years after surgery only 25% of all patients had long lasting good results. Patients who were pain free after facet infiltration had significant better initial results, but were similar to the others after 6 years. 6 out of 7 patients after lumbar spinal fusions demonstrated bad results. The worst results had those patients who had applied for early retirement (workmens compensation cases). In this group the recurrence rate was 74% 6 years after surgery. We found no correlation between the surgeon and the outcome.

Without pain reduction after facet infiltration the success rate after PRFD is low. Spinal surgery prior to PRFD significantly reduces the success rate. The worst prognosis have workmans compensation cases. The recurrence rate is high within the first 6 months after PRDF.