Fig 8. Transverse sonogram of the inner aspect of the proximal thigh 3 cm distal to the inguinal crease showing the needle near the posterior division of the obturator nerve at the beginning of the injection. (B) Annotated structures identified in (A). Abbreviations: AL m., adductor longus muscle; AB m., adductor brevis muscle; AM m., adductor magnus muscle. Green circle: local anesthetic ; blue stippled line : needle.