"Invasive techniques (e.g., local injections and facet-joint injections of cortisone and lidocaine) are of questionable merit. Although epidural steroid injections may afford short-term improvement in leg pain and sensory deficits in patients with nerve root compression due to a herniated nucleus pulposus, this treatment offers no significant long-term functional benefit, nor does it reduce the need for surgery. Despite the fact that proof is still lacking, many pain physicians believe that diagnostic and/or therapeutic injections may have benefit in patients presenting in the transitional phase between acute and chronic pain."
This was copied from the ACOEM 5th edition, chapter on lower back pain treatment.
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ESI's are just a way to relieve some pain and provide some relief for the patient. Many times the symptoms go away before they become "chronic." If after at least 3 months and none of the conservative methods of treatment have relieved the patient, then surgery becomes an option. Surgery is always optional and never required.
WC delays surgery way longer than ACOEM recommends.
For me, I had a cervical ESI and it backfired, flaring up RSD in my neck and entire arm. I've heard that the ESI's work much better in the lumbar region, and in most cases, do provide some short term relief. Go for it, and at least try one injection.
Now two years later, surgery has been approved for me. My doctor says because of the WC delays, I will have permanent nerve damage. I hope it isn't another year before it is scheduled.
Stay on top of your treatment and insist that the ACOEM guidelines are followed.
Have a good day. I'm off to yet another doctor appt.

Let Go, and Let God......