Preoperative
COLD
All PNB were performed by an experienced anesthesiologist under aseptic conditions, using a high-frequency (10–12 MHz) linear US probe (M-Turbo; SonoSite, Bothell, WA, USA), a 100-mm needle (Echoplex; Vygon, Lansdale, PA, USA) and 30 mL of 0.25% bupivacaine with 4 mg of dexamethasone. Thirty minutes after performing the intervention technique, the efficacy of the nerve block was evaluated by testing for loss to cold sensation in the saphenous nerve innervation area. Then, an IPACK block [