@ralph13 I also have advanced degenerative arthritis in my knees with my right knee being worse due to knee surgery in the 70s to remove torn cartilage. Now I have bone on bone in both knees but the right knee is the only one that bothers me. I'm planning on getting a total knee replacement in the Spring. I wasn't familiar with the FDA approval for the ablation so I did a little searching and I'm wondering if this was what you were referring to?

FDA Clears Halyard Health’s COOLIEF* for the Management of Osteoarthritis Knee Pain
-- http://www.orthospinenews.com/2017/04/20/fda-clears-halyard-healths-coolief-for-the-management-of-osteoarthritis-knee-pain/

I also found another article that may provide some more information on the Clinical Pain Advisor website.

Radiofrequency Ablation for Chronic Hip Pain: Reviewing the Evidence - March 2018
-- https://www.clinicalpainadvisor.com/arthritis/chronic-hip-pain-osteoarthritis-rheumatoid-arthritis-total-hip-arthroplasty-radiofrequency/article/753793/

John