Low vs Standard Local Anesthetics Boluses for Continuous Adductor Canal Block in Total Knee Arthroplasty

Total knee arthroplasty (TKA) is a commonly performed surgical procedure for patients with severe knee osteoarthritis. However, one of the challenges associated with TKA is the significant postoperative pain experienced by patients, which can delay early mobilization and physical therapy. Uncontrolled pain worsens patient outcomes and healthcare costs as it can increase the risk of complications after surgery. Therefore, effective pain management is important for optimizing patient outcomes and promoting a smooth recovery process.Despite the absence of a standardized recommendation for the volume and concentration of bolus administration in continuous adductor canal block (CACB), many previous studies, have demonstrated the efficacy of a high-dose bolus followed by a low-concentration local anesthetic infusion for CACB. However, these trials exhibited differences in the doses and volumes of bolus injection. Therefore, the necessity of high concentration and volume bolus CACB in combination with comprehensive multimodal analgesia and LIA for postoperative pain management in TKA remains uncertain. The aim of this study is to investigate the efficacy of two different regimens of local anesthetic used in boluses for continuous adductor canal block under ultrasound-guidance in total knee arthroplasty at King Chulalongkorn Memorial Hospital.