If you haven't had any pain relief at three to four weeks following Radiofrequency ablation, it is possible that your pain is not coming from the facet joint that was treated. I would make an appointment with your doctor to discuss this. Radiofrequency ablation is a procedure that burns the nerve in the facet joint. Once that nerve end is burned off, there should no longer be any painful signals sent to the brain. I typically consider this procedure to be unsuccessful in any patient who has not had relief within the first one to two weeks after the procedure. It is likely that there is something else that is causing your pain.