Patients and methods: The study, which was conducted between September 2012 and September 2013, included 62 patients with low back pain (38 males, 24 females; median age 45 years; min 22 - max 88 years). All injections were applied under C-arm fluoroscopy guidance, using a mix of betamethasone and lidocaine. A 100 mm Visual Analog Scale (VAS) for pain, Oswestry Disability Index (ODI), and Short Form-36 were administered before the injection, and at post-injection second and 12th weeks. Presence of any pain provocation was questioned during injection.

Results: The most frequent level of intervention was L5 level. Median initial VAS score was 80.0 (50.0;100.0) mm, which was measured as 45.0 (0.0;90.0) mm and 30.0 (0.0;100.0) mm at the post-injection second and 12th weeks, respectively. Median initial ODI score was 25.0 (9.0;43.0) points, which was measured as 17.0 (3.0;38.0) and 12.5 (1.0;38.0) points at the post-injection second and 12th weeks, respectively. All subgroup scores of SF-36 improved significantly during the follow-up period. We detected statistically significant improvements in the outcome measurements at the post-injection second and 12th weeks (p<0.05). There were significant differences between patients with positive and moderate pain provocation in terms of VAS (p=0.004) and ODI (p=0.006) scores.

Conclusion: In this follow-up study, transforaminal epidural steroid injection was found to be effective in both the early period and in the mid-term. Pain provocation was not clinically predictive for better outcome according to the results. Keywords : Effectiveness; epidural injection; low back pain; pain provocation