Assess the Effectiveness of Pulse RadioFrequency in Patients With Chronic Lumbar Radicular Pain

Inclusion Criteria: * \> 18 years of age * CLR for at least 4 months of more, with concordant findings on either MRI and CT scan * VAS score of at least 60/100 at presentation * informed consent Exclusion Criteria: * \< 18 years of age * patient refusal * any contraindication to neuraxial injection such as coagulation disturbance, anticoagulant therapy, bleeding disorder, or infection at site of injection * anatomical deformity or derangement, either congenital or surgical such as: extreme scoliosis, previous implant or instrumentation making it difficult to access the foramen as evidence by MRI, CT, or plain x-rays * uncontrolled diabetes or severe coronary vascular disease necessitating continuation of anticoagulation therapy * known history of psychiatric illness-such as depression or psychosis * presence of cancer accounting for present symptoms * patient's inability of communicate in English and inability to understand and fill out the required follow-up questionnaire and form * allergy to local anesthetics or steroid or contrast medium * any patient with a history of acute neurological weakness or neurodeficit in the affected limb in terms of measurable motor weakness or abnormal reflexes