Inclusion Criteria:  Age between 18 and 65 years Previous single-level, open, non-fusion discectomy for L4-5 or L5-S1 lumbar disc herniation within the past six months Having epidural fibrosis involving the L4, L5 or S1 nerve root on magnetic resonance imaging Having low back and leg pain for at least six months and unresponsive to conservative therapies A Numerical Rating Scale score of ≥4 Having a single-level epidural fibrosis in the operated level and side as assessed by contrast-enhanced spinal magnetic resonance imaging  Exclusion Criteria:  Having a multi-level epidural fibrosis Previous surgery for multi-level disc herniation Previous lumbar fusion surgery Having recurrent disc hernia Having sacroiliac/facet joint pain Having lumbar spinal stenosis, spondylolysis, spondylolisthesis, or scoliosis History of epidural steroid injection within the past six months Having bleeding diathesis Presence of systemic or local infections Pregnancy Known hypersensitivity to the injectates to be applied