The estimated prevalence of lumbar radiculopathy has been described as
9.8 per 1,000 cases of low back pain. There are various surgical and nonsurgical modalities
for treating lumbar disc herniation or radicular pain, including epidural injections. Epidural
injection administration routes include transforaminal, interlaminar, and caudal approaches. The
transforaminal approach requires the smallest volume to reach the primary site of pathology.
Systematic reviews have yielded highly variable results, but a recent systematic review showed
no significant difference among the 3 approaches.