Daily Single Shot Adductor Canal Block Versus Continuous Adductor Canal Block After Total Knee Arthroplasty

Analgesic Efficacy of Daily Single Shot Adductor Canal Block Versus Continuous Adductor Canal Block After Total Knee Arthroplasty

This study will compare the analgesic efficacy of daily single-shot adductor canal block(ABC) versus continuous ACB after total knee arthroplasty (TKA).

Patients 19-75 years old, of ASA classification I-III scheduled for unilateral TKA, will be enrolled and randomized into two groups, single-shot ACB group and continuous ACB group. In both groups, participants will be administered a single-shot ACB immediately after the end of the operation. The single-shot ACB group will receive two separate single-shot ACBs, on the first and second postoperative day. A nerve block catheter will be placed in patients in the continuous ACB group, which will be connected to a patient-controlled analgesia pump until the second postoperative day. The primary outcome of this study is the average NRS pain score at rest from the end of surgery to 2 days after surgery.

Inclusion Criteria:

• ASA classification I, II, III
• Patients scheduled for unilateral knee arthroplasty

Exclusion Criteria:

• Anesthesia other than spinal anesthesia
• Chronic opioid use
• Uncontrolled diabetes of HbA1c>7.5
• Neuromuscular pathology of the ipsilateral leg
• Second-look knee arthroplasty
• Inability to communicate (e.g. dementia)
• Hypersensitivity to ropivacaine
• BMI > 40
• Pregnancy