@kathleen1314 The RFA uses a heated electric probe to "burn" the nerve sheath around an affected area. This basically kills off the sensation of pain/discomfort.

In fact, I did have this procedure done. As it was in my right knee, it was referred to as a genicular radio frequency ablation. The temporary nerve block done ahead of time, to see if a RFA might work, was successful, then came the approval period for the procedure. It was not painless, to be sure! It created a feeling of a very painful sunburn deep in the affected area as the heated probe burned the nerve sheath. There is a varying amount of time with no pain, from 2 months to 2 years. For me, it was not successful.

Working with a good orthopedic doctor is crucial. Their expertise in "getting to the right area" to treat is so important. Here is an article from Northwestern Medicine that you will find helpful: https://www.nm.org/conditions-and-care-areas/treatments/genicular-nerve-ablation
I hope this helps give you some information? By the way, I am not a good surgical candidate for knee replacement due to co-existing health conditions.
Ginger