Nerve Block Washout

Injecting local anesthetic to anesthetize a nerve or group of nerves (a 'nerve block') is an effective way to eliminate pain during and after surgery. There are instances when it would be beneficial to the patient for the nerve block to be resolved quickly rather than waiting for it to naturally wear off. For example, a sciatic nerve block that freezes the lower leg and foot typically takes over 18 hours to resolve on its own, and both the surgeon and patient prefer to have motor function before discharge. The investigators wish to perform a randomized, controlled trial to determine if infusion of a solution such as saline to 'wash out' the nerve block after surgery can allow the patient to be pain-free while still being able to move their leg and foot.