• Shinobu Seki, Masanori Yamauchi, Maiko Kawamura, Akiyoshi Namiki, Yutaka Sato, and Yoshihiro Fujiwara.
• Department of Anesthesiology, Sapporo Medical University School of Medicine, Sapporo 060-8543.
• Masui. 2010 Jun 1;59(6):686-90.

BackgroundWe investigated the onset time of obturator nerve block and time required for the nerve block comparing two groups in a prospective randomized study.MethodsObturator nerve block was performed in 37 cases by either nerve stimulation guide (NS group) or nerve stimulation and ultrasound guide (US group) with 10 ml of 1.5% lidocaine adding 1:200000 epinephrine.ResultsThere was no significant difference between the onset time in the NS group (6.1 min) and that in the US group (5.7 min). The time required for the nerve block (4.2 min vs 1.7 min) was significantly shorter, and the frequency of needle advancement for the optimal position (4.7 vs 1.7) was significantly smaller in the US group than in the NS group (P<0.05).ConclusionsUltrasound imaging facilitated the identification of obturator nerves between adductor muscles. Ultrasound-guided obturator nerve block is a safe, quick and useful technique.

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