Treatment · Updated October 6, 2026
Define the test
The practice lists diagnostic facet joint blocks. Ask whether the clinician means a medial branch block or an injection into the joint; the target, interpretation, and later choices differ. A pain diary should name activities that reliably provoke the usual pain.
The block should test a question that can change care. If a result would not affect the next step, ask why the diagnostic procedure is needed.
Interpret the short window
Local anesthetic works for a limited time. Note the change during the interval the clinician specifies, including any activities you could or could not perform. Sedation, rest, or an unusually quiet day can complicate interpretation.
Ask whether the injectate contains only local anesthetic or another medicine, and whether sedation is planned. Those details can affect how the short response is interpreted. A baseline diary makes it easier to compare the usual symptom with the post-block window.
Use the result
A convincing response may lead to a discussion of radiofrequency ablation in selected cases. No response may prompt another source evaluation. Payer criteria for repeat blocks or ablation are separate from the clinical discussion and need current verification.
Do not judge the test from a single pain score taken while resting. Report the result during the agreed activities and time frame, including any new soreness. The clinician can then explain whether the record actually supports an ablation discussion.
Questions to ask
- Is this a medial branch block or an intra-articular injection?
- What level and response threshold are being assessed?
- What happens after a positive, negative, or unclear test?