[Effective volume of local anesthetics for fascia iliac compartment block: a double-blind, comparative study between 0.5% ropivacaine and 0.5% bupivacaine.].

Background And Objectives: Fascia iliac compartment block is widely used as one of the anesthetic techniques used for surgical interventions of the hip, thigh, and knee. The majority of the studies have used fixed volumes of ropivacaine or bupivacaine. The objective of this study was to calculate the effective volume of 0.