Comparing ACB+IPACK and ACB+BiFeS Block Combinations for Analgesia in Total Knee Arthroplasty

Inclusion Criteria: * Scheduled for primary total knee arthroplasty surgery * ASA physical status classification I-III * Hemodynamically stable * Age ≥ 18 years and ≤ 80 years * BMI ≤ 35 kg/m² * Signed written informed consent form Exclusion Criteria: * Revision total knee arthroplasty surgery * Simultaneous bilateral total knee arthroplasty * BMI \> 40 kg/m² * ASA physical status classification 4-5 * Inability to perform NRS pain scoring * Known allergy to local anesthetics * Pregnancy or breastfeeding * Age \< 18 or \> 80 years * Uncontrolled anxiety disorder * Alcohol or drug dependency * Neuromuscular disease or peripheral nerve disease * High-dose opioid use within 3 days prior to surgery * Widespread chronic pain syndrome * Diabetes mellitus * Hepatic or renal insufficiency * Coagulation disorders * Current use of anticoagulant medications * Infection at the peripheral nerve block needle insertion site * Refusal to participate in the study