Single-injection Adductor Canal Block for Total Knee Arthroplasty Under Spinal Anesthesia

The Effect of Postoperative Single-injection Adductor Canal Block for Multimodal Pain Control in Patients Receiving Total Knee Arthroplasty Under Spinal Anesthesia

This study evaluates the effect of the single-injection adductor canal block in patients receiving total knee arthroplasty under spinal anesthesia.

This study aims to evaluate the effect of the single-injection adductor canal block in patients receiving total knee arthroplasty under spinal anesthesia. The effect of the single-injection adductor canal and continuous adductor canal block in patients receiving total knee arthroplasty under general anesthesia has been well established. However, due to the residual effect of spinal anesthesia, the effect of the single-injection adductor canal block needs to be determined. The investigators hypothesize that the single-injection adductor canal block will decrease the total sum of 2h, 6h, 12h, and 24h pain score.

Inclusion Criteria:

• adult patients receiving total-knee arthroplasty under spinal anesthesia
• ASA class 1-3

Exclusion Criteria:

• infection at the needle injection site
• hard for pain evaluation
• CRPS patient with lower extremity symptom
• chronic opioid user
• those with side effect to local anesthetics
• those getting revision total-knee arthroplasty or with the previous operation at the same knee area
• those getting the surgery under general anesthesia due to the failed spinal anesthesia