@golfer18 Did you ask the doctor what an ablation is? From my understanding, an ablation destroys something that is malfunctioning as a way to remove it. A transformational injection would be to introduce a steroid to reduce inflammation as a temporary treatment for pain.

A radiofrequency neurotomy is an ablation of a nerve. This link gives more information. It does say that it can treat pain in buttocks, but not below the knee.
https://www.mayoclinic.org/tests-procedures/radiofrequency-neurotomy/about/pac-20394931
Your doctor is the best one to explain his choices in your treatment. Can you send him a question on a patient portal?