Transforaminal epidural steroid injection can result in further neurological injury in a patient with severe foraminal stenosis and nerve impingement.

Background: Chronic low back pain (LBP) is highly prevalent and costly in our society. The use of epidural steroid injections (ESIs) for the treatment of radicular LBP is very widespread and continues to rise. The most popular injection is the lumbar/sacral transforaminal epidural steroid injection (TFESI). Here, we present a serious neurological complication resulting from such a TFESI that was only reversed by timely neurosurgical intervention.

Case Description: A 49-year-old male presented with a 5-year history of progressive neurogenic claudication and right lower extremity pain/radiculopathy. He had previously received multiple lumbar ESIs and other conservative therapy. Due to a recent exacerbation of his radiculopathy associated with MRI-documented lumbosacral spondylosis, he underwent a right L5/S1 TFESI under fluoroscopic guidance. This resulted in acute right lower extremity weakness accompanied by a right-sided foot drop and sphincter dysfunction. Although the follow-up MRI was noncontributory, the EMG showed L5/S1 denervation, and the patient underwent an L4-5, L5-S1 laminectomy with discectomies at the L4-5 and L5-S1 levels. Immediately after the surgery, the patient's weakness and sensory deficits improved. Two years later, the patient continued to do well without evidence of recurrence of signs or symptoms of lumbosacral radiculopathy.

Conclusion: Patients should be counseled about the risk and benefits of TFESI. Surgical treatment may be warranted in patients who develop acutely progressive worsening following these non-FDA (Food/Drug Administration) approved injections.