We were recently interested by an article published in the Asian Spinal Journal by Karamouzian et al. [1], entitled "Comparison of two methods of epidural steroid injection in the treatment of recurrent lumbar disc herniation". The authors presented an intriguing investigation comparing the effectiveness of the different methods of epidural steroid injection (ESI) in patients with recurrent lumbar disc herniation, and reported similar outcomes of transforaminal and caudal steroid injection procedures in the treatment of lumbar disc herniation. Although caudal and transforminal steroid injections are the commonly performed techniques in the management of the pain of disc herniation, the results are unsatisfactory, given the certain unique risks carried by ESI procedures. To Karamouzian et al. discussion, we also note the risks and complications of ESIs in the spine, which is evident in the results discussed below.

Some studies in the literature showed that ESIs is no better or even worse than a placebo. It is also observed that ESIs is often implicated in permanent and severe complications such as spinal cord infarction, infection, intravascular injections, injections into the spinal fluid, nerve damage, hemorrhages, paralysis, weakening the disc or leading to discitis and archnoiditis [2,3]. Moreover, transforminal steroid injection technique does not decrease the risk of known complications of interlaminar steroid injection procedure, including hematoma formation, subdural and dural punctures, and cauda-equina syndrome [4].

Also, Manchikanti et al. [5] in a prospective, non-randomized study of patients undergoing ESIs observed complications including intravascular injection, local bleeding, oozing, and local hematoma with profuse bleeding. Other reports [6,7] indicated that ESIs provided no additional improvements and no significant functional benefits or reduction in the need for surgery.

As is obvious from the above discussion, although ESI approaches are commonly performed techniques in the management of the pain of disc herniation, complications and pitfalls of ESIs should be assessed to alter and add more consistency to the results.