The degree of pain is assessed with a 10-cm VAS. "0" identifies the least possible pain and "10" determines the most severe pain that can be considered. We evaluate the health status of patients by the WOMAC index which is valid and reliable self-administered questionnaire including 24 items divided into 3 subscales (pain, stiffness, and physical function).(1,2) Visual Analog Scale (VAS) and Western Ontario and McMaster Universities Osteoarthritis Index LK 3.1 (WOMAC) and supplemental analgesic requirements, any side effects and complications such as a motor or sensorial loss are recorded in both groups at before the procedure and at 1, 4, and 12 weeks after the procedure. We assess the patients when they are requested to our clinic for clinical examination. We also call them by telephone to any further advice.