The treatment of persistent lumbar radicular pain (LRP) using CT-guided epidural steroid injection (ESI) is widely used and associated with rare but serious complications. Platelet-rich plasma (PRP), which has recently been shown to promote healing and the anti-inflammatory process by delivering growth factors and cytokines, could be an alternative and potentially safer option. A previous study showed that PRP was as effective as ESI in treating this condition, without major complications. This study aims to compare these two treatments over the long term (2 years).