Postoperative Effects of Femoral Triangle Block Versus Adductor Canal Block on Early Quadriceps Function After Total Knee Arthroplasty Under a Multimodal Analgesia Protocol: A Randomized Double-Blind Controlled Trial
The goal of this clinical trial is to compare the effects of femoral triangle block (FTB) and adductor canal block (ACB) on early quadriceps function after total knee arthroplasty (TKA). The main question it aims to answer is whether FTB causes more early quadriceps functional impairment than ACB under a standardized multimodal analgesia protocol. Researchers will compare FTB and ACB using a composite binary functional outcome measured 6 hours after block completion. Quadriceps functional impairment is defined as the inability to perform a structured straight leg raise or quadriceps muscle strength \<50% of the preoperative baseline. Participants will be randomly assigned to receive ultrasound-guided FTB or ACB. All participants will also receive a popliteal plexus block and standardized multimodal analgesia.
• Adult patients (≥ 20 years of age) are scheduled to undergo primary unilateral TKA.
• American Society of Anesthesiologists (ASA) physical status I-III.
• Ability to ambulate independently prior to surgery.
• Ability to understand the study procedures and provide written informed consent.
• Planned perioperative anesthesia management including regional anesthesia as part of standard clinical care.
• Ability to extend the knee below 30 degrees preoperatively (no knee extension contracture)