A Prospective Randomized Comparative Trial of Targeted Injection Via a Transforaminal Approach With Dexamethasone Versus an Epidural Catheter Via an Interlaminar Approach With Particulate Steroid for the Treatment of Cervical Radicular Pain

Two distinct techniques used to administer epidural steroids specifically to the nerve root affected in a radicular pain syndrome, which include transforaminal access at the level of pathology and interlaminar interlaminar access at the C7-T1 level with subsequent advancement of an epidural cathether to the level of pathology. Use of an epidural catheter is necessary in order to achieve a targeted injection via an interlaminar approach in order to prevent dural puncture or direct spinal cord trauma. Anatomic studies confirm the distance between the ligamentum flavum and dura is on average, 4 mm at the C7-T1 or C6-C7 levels, but 1mm or smaller at C5-C6 and more rostral levels. Therefore, there is likely greater risk of dural puncture and spinal cord injury when "targeting" steroid delivery using only the interlaminar technique directly at the level where pathology is located (C4-C5, or C5-C6, for example). Thus, the interlaminar placement of a needle rostral to the C6-C7 level has been strongly discouraged.

Both the transforaminal injection approach and the targeted catheter approach demonstrate effectiveness. Studies have demonstrated the effectiveness of transforaminal epidural steroid injection for the treatment of cervical radicular pain. Our own recent work demonstrates the clinical effectiveness of the catheter-based targeted approach. However, these two approaches have never been directly compared. Thus, we aim to compare the differences in pain reduction, medication utilization, functional outcomes, patient satisfaction, and surgical rate reduction between these two approaches to the treatment of cervical radicular pain.

Cervical radicular pain is a common syndrome, often treated with epidural steroid injection (ESI). An approach that targets the therapeutic agent, corticosteroid, at the site of spinal pathology can be performed via a transforaminal approach or via a interlaminar approach at C7-T1 with subsequent epidural catheter advancement to the symptomatic level. There are no universal guidelines that recommend the use of one technique over the other. We will directly compare the clinical effectiveness of these two approaches as measured by pain reduction, medication utilization, functional outcomes, patient satisfaction, and surgical rate reduction. The results of this study will potentially influence clinical practice recommendations regarding the treatment of cervical radicular pain. If one technique proves superior, instating this technique will have implications potentially for reducing opioid use, surgery and other healthcare utilization, and general healthcare cost related to the treatment of cervical radicular pain.