Radiofrequency Applications and Alcoholic Neurolysis of Genicular Nerve for the Treatment of Knee Osteoarthritic Pain

Inclusion Criteria: * Age \> 18 years old. * Both sexes. * Patients with knee osteoarthritis. * Previous conservative treatments longer than 3 months. * visual analog scale (VAS)≥ 4. * Radiological osteoarthritis grades 3 and 4 according to the Kellgren-Lawrence grading system (0 = none, 1 = doubtful, 2 = minimal, 3 = moderate, and 4 = severe). Exclusion Criteria: * Patient refusal. * History of knee surgery. * Radiculopathy. * Anticoagulant therapy. * Injection with steroids or hyaluronic acids during the previous 3 months. * Serious neurologic or psychiatric disorders.