Cervical Medial Branch Block (MBB)
A cervical medial branch block is primarily a diagnostic procedure used to determine whether cervical facet joints are a significant source of chronic axial neck pain.
The medial branch nerves carry pain information from the cervical facet joints. During an MBB, a small amount of local anesthetic is placed near selected medial branch nerves under fluoroscopic guidance. The purpose is to temporarily numb those nerves and measure the change in the patient’s typical neck pain.
Who Is Evaluated for a Cervical MBB?
The procedure is most relevant for predominantly axial neck pain when the clinical evaluation suggests a facet-mediated source. Symptoms such as arm pain, numbness, tingling, or weakness may indicate cervical nerve-root involvement and require a separate evaluation; an MBB is not designed to treat cervical radiculopathy.
The MBB → RFA Pathway
If the patient experiences the expected degree of temporary relief and the result meets clinical and insurance criteria, confirmatory diagnostic testing may be performed. When the diagnostic blocks support facet-mediated pain, cervical radiofrequency ablation (RFA) may be considered for longer-lasting treatment.
What to Expect
Using fluoroscopic guidance, the physician positions a needle near the selected cervical medial branch nerves and injects a small amount of local anesthetic. The response is assessed over the expected duration of the anesthetic. The procedure is diagnostic and is not intended to provide permanent pain relief.
Potential Risks
Potential risks include bleeding, infection, medication reaction, temporary numbness or weakness, soreness, injury to nearby structures, and an inconclusive diagnostic response. These are reviewed before treatment.
Arm pain, numbness, tingling, or weakness suggesting radiculopathy requires a separate nerve-root evaluation
Clinical Evidence, Limitations & Patient Selection
Cervical MBB is primarily a diagnostic/prognostic local-anesthetic block used to evaluate facet-mediated axial neck pain and RFA candidacy.
Important limitation: Routine steroid use and routine sedation can reduce diagnostic clarity and are not the core diagnostic approach. MBB is not a treatment for cervical radiculopathy.
Every procedure has potential risks, and individual benefit cannot be guaranteed. Recommendations at Solutions in Pain are based on the diagnosis, examination, relevant imaging, prior treatment, medical history, medications, patient goals, current evidence, and applicable payer requirements.
Selected Evidence & Guidelines
Patient-education content updated September 2026. This information does not replace an individualized medical evaluation or informed-consent discussion.
