Inclusion Criteria:  chronic knee pain that does not respond to conservative treatment (physiotherapy, oral analgesic, steroid intra-articular injection, Hyruan injection) for more than 6 months A score of 6 or higher (out of 10) on the target knee's numerical rating scale Knee osteoarthritis 1-4 confirmed in knee X ray within 6 months of study enrollment  Exclusion Criteria:  Systemic inflammatory diseases such as rheumatic diseases uncontrolled diabetes malignant tumor If the target knee has a previous surgical history (arthroscopy, arthroscopy, autologous or allograft osteochondral transplantation and autologous cartilage cell transplantation, osteotomy, arthritis surgery) Patients with lidocaine and contrast agent allergy history of nerve block in the target knee within 2 weeks Body mass index over 40 kg/m2 bleeding disorder Pregnant/lactating women Inability to understand informed consent and respond to research questionnaires due to cognitive impairment Unable to read consent form (e.g. illiterate, foreigner, etc.)