Continuous administration of local anesthetics to the distal adductor canal could spread into the popliteal fossa and contribute to analgesic effects on posterior knee pain. Periarticular local anesthetic infiltration is a component of multimodal joint pathways and the posterior knee capsule was among the tissues routinely infiltrated. It is expected that there will be overlapping effects of distal adductor canal block and periarticular injection. Therefore, we aim to compare the postoperative pain in the group that received only continuous distal adductor canal block and the group that received both continuous distal adductor canal block and periarticular injection. Sixty-six patients scheduled for total knee arthroplasty will be randomly divided into the two groups. In group 1, the adductor canal catheter is inserted 2cm above the adductor hiatus. In group 2, the adductor canal catheter is inserted where the nerve block performed in group 1 and periarticular injection are performed intraoperatively.

Inclusion Criteria:

1. Patients aged 19 years old or older, with American Society of Anesthesiologists Physical Status 1-3, and scheduled for elective unilateral total knee arthroplasty

Exclusion Criteria:

1. Allergy or intolerance to any of the drugs used in the study 2. Hepatic or renal insufficiency 3. Opioid dependency 4. Coagulopathy 5. Pre-existing neurologic or anatomic deficits in the lower extremities 6. Severe psychiatric illness