Patients received ultrasound-guided sciatic nerve blocks by using 0.5 % bupivacaine with epinephrine 1:300,000 ( 0.45 mL/kg ) and were randomized into 3 groups : group 1 = perineural dexamethasone 8 mg/2 mL with 50 mL IV normal saline , group 2 = perineural saline/2 mL with IV 8 mg dexamethasone in 50 mL normal saline , and group 3 = perineural saline/2 mL with 50 mL normal saline .