@martyk - There are a few discussions that discuss radiofrequency ablation.

-- Radiofrequency Ablation for SI joint pain: https://connect.mayoclinic.org/discussion/radiofrequency-ablation-for-si-joint-pain/
-- Knee and hip nerve ablation: https://connect.mayoclinic.org/discussion/knee-and-hip-nerve-ablation/

Here's some information from Mayo Clinic that discusses the procedure - "Radiofrequency neurotomy uses heat generated by radio waves to target specific nerves and temporarily turn off their ability to send pain signals. The procedure is also known as radiofrequency ablation. Needles inserted through your skin near the painful area deliver the radio waves to the targeted nerves." -- Radiofrequency neurotomy: https://www.mayoclinic.org/tests-procedures/radiofrequency-neurotomy/about/pac-20394931