Cold bupivacaine versus magnesium sulfate added to room temperature bupivacaine in sonar-guided femoral and sciatic nerve block in arthroscopic anterior cruciate ligament reconstruction surgery.

Background: Cooling of local anesthetic potentiates its action and increases its duration. Magnesium sulfate (MgSo) added to local anesthetic prolongs the duration of anesthesia and postoperative analgesia with minimal side effects.

Aim: The aim of this prospective, randomized, double-blind study was to compare the effect of cold to 4°C bupivacaine 0.