A lumbar medial branch block (MBB) is a diagnostic injection used to determine whether the facet joints are the source of chronic lower back pain. Under fluoroscopic guidance, anesthetic is injected near the medial branch nerves that carry pain signals from the spine. If the injection provides significant temporary relief, it confirms those nerves are involved — and the patient may be a candidate for radiofrequency ablation (RFA) for longer-lasting relief. #painmanagement #painrelief | Precision