Radiofrequency ablation  for SI joint pain is a minimally invasive procedure that targets the lateral branch nerves around the sacroiliac joint. These nerves carry pain signals from the joint, and RFA uses controlled heat to disrupt those signals, often providing longer-lasting relief than injections. It’s usually considered after a patient has significant but temporary improvement from diagnostic SI nerve blocks. Pain relief can last 6–12 months or more, though the nerves may eventually regenerate. Risks are low but can include temporary soreness, numbness, or irritation at the treatment site.