How long does a facet joint injection last

Facet joint injections can be performed purely as a diagnostic block by injecting only local anesthetic or for therapeutic purposes by adding corticosteroid to the local anesthetic. A local anesthetic block lasts only for a few hours. An injection using a corticosteroid and local anesthetic combination may last up to 2 weeks (see Figs. 16-5 and 16-6).

Figure 16-5. A, Lumbar facet injection. The needle is placed in the left L4-L5 facet joint. B, Injection of contrast shows dye flow into joint space, confirming the needle placement.
Figure 16-6. A, Cervical facet injection. The needle is placed in the cervical facet joint. B, Injection of contrast confirms needle placement.
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