There are 3 types of Epidural injection techniques currently being used: transforaminal (TFEI), interlaminar (ILEI), and caudal epidural injections (CEI).
Transforaminal lumbar epidural steroid injection
In 1997 Carette et al stated that although epidural corticosteroid injections of methylprednisolone may afford short-term improvement in leg pain and sensory deficits in patients with sciatica due to a herniated nucleus pulposus, this treatment offers no significant functional benefit, nor does it reduce the need for surgery 1).