Fig. 3From: 95% effective volume of ropivacaine for ultrasound‑guided supra‑inguinal fascia iliaca compartment blockThe up-and-down sequence of volumes of ropivacaine 0.33% required for ultrasound supra-inguinal fascia iliaca compartment block to produce effective femoral nerve block and lateral cutaneous nerve block. □ failed block, • successful block. The minimum effective volume 95 is represented as a continuous line and the 95% confidence interval as dashed linesBack to article page