Butorphanol as an Adjuvant to Ropivacaine for Adductor Canal Blocks in Total Knee Arthroplasty Patients: A Randomized, Double, Blind Study

Figure 1

Ultrasound images (a) before and (b) after ACB. Abbreviations: SM, sartorius muscle; AL, adductor longus; AM, adductor magnus; VM, vastus medialis; FA, femoral artery; FV, femoral vein; SN, saphenous nerve; LA, local anesthetic.

(a)

(b)