Efficacy of Epidural Etanercept in the Treatment of Sciatica

Tumor necrosis factor (TNF)-alpha has been strongly implicated as a major contributing factor for the development of radiculopathy. In animal studies, the application of TNF-alpha to nerve roots results in pain behavior indicative of radiculopathy. The use of TNF-alpha inhibitors (etanercept and infliximab) have been shown to prevent this pain behavior. Open-label studies in humans have shown both etanercept and infliximab provide excellent, long-term relief in patients with acute radiculopathy from herniated disc. However, a recent placebo-controlled study failed to demonstrate any significant difference from placebo. The investigators have already established the safety of neuraxial etanercept in a trial that has just been completed (not yet published). The objective of this study is to determine whether small doses of epidural etanercept, an anti-TNF-a medication, is an effective treatment for LBP caused by nerve root irritation (i.e., radiculopathy).

Sex

All

Minimum age

18 Years

Maximum age

70 Years

Inclusion Criteria:

1. Chronic low back pain of radicular origin of \> 2 months but \< 1 year duration.
2. Failure of conservative therapy to include physical and pharmacotherapy.
3. MRI evidence of a herniated disc corresponding to the patient's radicular symptoms.
4. Normal white blood cell count (drawn in 1 blood vial).

Exclusion Criteria:

1. Uncontrolled coagulopathy.
2. Pregnancy, which will be ruled out by a urine pregnancy test if any question as to the patient's status exists.
3. Allergy to contrast dye.
4. Unstable medical condition (e.g., unstable angina or congestive heart failure).
5. Rheumatoid arthritis, Crohn's disease or spondylarthropathy.
6. Unstable neurological condition (e.g., multiple sclerosis)
7. Systemic infection
8. Age \< 18 or \> 70 years.

• RESULTOzaktay AC, Cavanaugh JM, Asik I, DeLeo JA, Weinstein JN. Dorsal root sensitivity to interleukin-1 beta, interleukin-6 and tumor necrosis factor in rats. Eur Spine J. 2002 Oct;11(5):467-75. doi: 10.1007/s00586-002-0430-x. Epub 2002 Jun 4. PMID 12384756
• RESULTOlmarker K, Larsson K. Tumor necrosis factor alpha and nucleus-pulposus-induced nerve root injury. Spine (Phila Pa 1976). 1998 Dec 1;23(23):2538-44. doi: 10.1097/00007632-199812010-00008. PMID 9854752
• RESULTOlmarker K, Nutu M, Storkson R. Changes in spontaneous behavior in rats exposed to experimental disc herniation are blocked by selective TNF-alpha inhibition. Spine (Phila Pa 1976). 2003 Aug 1;28(15):1635-41; discussion 1642. doi: 10.1097/01.BRS.0000083162.35476.FF. PMID 12897484
• RESULTIgarashi T, Kikuchi S, Shubayev V, Myers RR. 2000 Volvo Award winner in basic science studies: Exogenous tumor necrosis factor-alpha mimics nucleus pulposus-induced neuropathology. Molecular, histologic, and behavioral comparisons in rats. Spine (Phila Pa 1976). 2000 Dec 1;25(23):2975-80. doi: 10.1097/00007632-200012010-00003. PMID 11145807
• RESULTKorhonen T, Karppinen J, Malmivaara A, Autio R, Niinimaki J, Paimela L, Kyllonen E, Lindgren KA, Tervonen O, Seitsalo S, Hurri H. Efficacy of infliximab for disc herniation-induced sciatica: one-year follow-up. Spine (Phila Pa 1976). 2004 Oct 1;29(19):2115-9. doi: 10.1097/01.brs.0000141179.58778.6c. PMID 15454701
• RESULTKorhonen T, Karppinen J, Paimela L, Malmivaara A, Lindgren KA, Jarvinen S, Niinimaki J, Veeger N, Seitsalo S, Hurri H. The treatment of disc herniation-induced sciatica with infliximab: results of a randomized, controlled, 3-month follow-up study. Spine (Phila Pa 1976). 2005 Dec 15;30(24):2724-8. doi: 10.1097/01.brs.0000190815.13764.64. PMID 16371894
• RESULTGenevay S, Stingelin S, Gabay C. Efficacy of etanercept in the treatment of acute, severe sciatica: a pilot study. Ann Rheum Dis. 2004 Sep;63(9):1120-3. doi: 10.1136/ard.2003.016451. Epub 2004 Apr 28.