The patient is supine with the knees flexed and the plantar part of his
feet joined. Mark the skin projection of the ischial tuberosity on both
sides. At this level a very short beveled needle is inserted in a
medial direction until a loss of resistance corresponding to the
piercing of the obturator fascia is felt.
This block is particularly useful to
complete anesthesia following ilioinguinal/iliohypogastric nerve block
when the posterior part of the scrotum is involved in surgery.