Inclusion Criteria:  Age 18 years or above average radicular leg pain of ≥ 4 (numerical rating scale (NRS) 0-10) over the past week, Unilateral radicular leg pain symptoms and/or signs of lumbosacral radicular pain (such as lower leg pain or back/buttock pain radiating to lower limb or positive straight leg raising or lower limb numbness or altered lower limb sensation) pain duration more than 6 weeks Imaging findings (magnetic resonance imaging) of a pathologic condition correlating with symptoms or signs (herniated disc or annular tear or spinal stenosis) able to provide informed consent  Exclusion Criteria:  patients require surgical intervention coagulopathy (platelet count less than 100,000/ml, international normalized ratio [INR] over 1.5). Using anticoagulant and/or antiplatelet medication (not including aspirin) received epidural steroid injection within the past 1 year systemic infection previous lumbar spine surgery allergy: contrast dye, steroids, PRP, local anaesthetic pregnancy physically unable to tolerate epidural injection uncontrolled psychiatric disorder (Beck depression score ≥ 21) active or a history of substance use disorder (including alcohol, opioid) known secondary gain (eg active litigation) patients with predominantly neurogenic claudication (pain over the calves, buttock, and/or thigh triggered by walking and/or prolonged standing in upright position). back pain greater than leg pain