Patients received ultrasound-guided sciatic nerve blocks by using @ % bupivacaine with epinephrine @:@,@ ( @ mL/kg ) and were randomized into @ groups : group @ = perineural dexamethasone @ mg/@ mL with @ mL IV normal saline , group @ = perineural saline/@ mL with IV @ mg dexamethasone in @ mL normal saline , and group @ = perineural saline/@ mL with @ mL normal saline .