A Study Comparing Continuous Sciatic Nerve Block to Single Shot Sciatic Nerve Block

Inclusion Criteria: * all patients ( ≥18 and ≤ 80) who are scheduled to undergo elective scheduled foot surgery and agreed to receive a sciatic nerve catheter as a part of their postoperative pain management. this study. Exclusion Criteria: * history of hemostatic abnormalities * chronic pain syndrome * a foot deformity restricting normal foot movement * severe liver or renal disease * a preexisting neurologic disorder * patient refusal to participate * the presence of language barrier that prohibits proper communication with patient.