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Abstract
If the condition not improved by medical treatment, epidural steroid injection have a role to reduce pain and improve disability by decrease inflammatory process at the nerve root caused by herniated disc. Different types of epidural steroid injection are present according to the rout of needle entry to reach to epidural space. There are three types of ESI which are 1 caudal, 2 lumbar interlaminar and 3 transformaminal. In this study we evaluate and compare the clinical improvement of cases treated by caudal and lumbar interlaminar ESI. Clinical improvement represented by pain reduction and improvement of disability after 4 weeks of ESI which obtained by visual analog scale and oswestry disability index score