Distribution of Various Volumes of Methylene Blue Injection in Suprainguinal Fascia Iliaca Block Under Ultrasound Guidance: A Cadaveric Study

The local anesthetic volume for a single-shot suprainguinal fascia iliaca block (SFIB) is key factor of success because the courses three target nerves from lumbar plexus (LP), lateral femoral cutaneous nerve (LFCN), (FN), and obturator (ON), at inguinal area are isolated within striking distance. Thus, this cadaveric study aims to demonstrate distribution dye staining on LFCN, FN, ON, LP following ultrasound-guided SFIB using 15-50 ml methylene blue. A total 40 USG-SFIBs were performed 20 fresh adult cadavers 15, 20, 25, 30, 35, 40, 45, 50 After injections, pelvic regions dissected directly visualize stained LP. All FN LFCN heavily when was injected. Higher volumes (40-50 ml) spread more medially ON in 60 % cases. To increase possibility spreading all SFIB, high (≥40 recommended. If only blockade required, low (15-25 sufficient.