Objective
To evaluate the efficacy of epidural injections of steroid and local anesthetics with the modified Dallas pain questionnaire in the low back pain patients.

Method
Before and after epidural injections with triamcinolone and local anesthetics, we examined the patients with modified Dallas pain questionnaire. The efficacy was assessed by paired t test to compare the results of this questionnaire.

Results
Four aspects of the patient's life (daily activity, work and leisure activity, anxiety- depression, and social interest) were significantly improved after epidural injection in low back pain patients. And their improvements were more definite in patients diagnosed with herniatied lumbar disc, relatively acute onset of symptom, and more serious findings in MRI.

Conclusion
Epdiural injections of steroid and local anesthetics are effective for patients with low back pain, espercially for improving life quality of patients such as daily activity and work-leisure activity. It also decreases anxiety and increases social interest in some patients. However, validity of modified Dallas pain questionnaire must be proved in the future.