Functional Outcome and Analgesia in TKA: Radiofrequency vs Continuous Adductor Canal Block

Inclusion Criteria: * Diagnosis of knee Osteoarthritis requiring Total Knee Arthroplasty (TKA) Exclusion Criteria: * Previous TKA (revision surgery) * ASA (American Society of Anesthesiology) Classification \> 3 * Known Rheumatologic disease * Morbid Obesity (BMI \> 45) * Inability to perform simple physical tasks (6 minutes walk test, Timed-Up and Go test) * Organ transplant, Allergy to opioids, to local anesthetics or other medications used in the study, * Chronic use of opioids or sedatives, Contraindication to receive regional anesthesia (e.g. coagulation defect), contraindication to Patient Controlled Analgesia pump (PCA) or inability to use PCA or to comprehend pain scales