The simultaneous block of these two nerves provides anesthesia for
surgery on the inguinal region: hernia repair, orchidopexy, hydrocele.
The line uniting the anterior superior iliac spine to the umbilicus is
divided in four equal parts. A short beveled needle is then introduced
vertically at the union of the most lateral part to the medial
three-quarters of the line. The needle is introduced perpendicular to
the skin until there is a loss of resistance, corresponding to the
piercing of the superficial layer of the external oblique muscle.
demonstrated with the use of the ultrasound technique that the landmark
is more lateral compared to the previous point of injection: less than
1 cm medial to the anterior superior iliac spine and in a double blind
study they succeeded in reducing the amount of administered drug in the
ultrasound group—only 1 to 2 mL—with an increase in duration of
The iliohypogastric and ilioinguinal nerves are terminal branches of the lumbar plexus that supply the inguinal and pubic area.
This block represents a valid alternative to the caudal block for surgery on the inguinal area with less morbidity.
Undesired femoral nerve block can
occasionally (1 out of 9) occur due to the spread of the local
anesthetic to the inguinal ligament.
Figure 52-1. Anterior superior iliac spine and the umbilicus.
RS, Broadman LM, Belman AB, et al. Comparison of caudal and
ilioinguinal/iliohypogastric nerve block for control of
post-orchidopexy pain in paediatric ambulatory surgery. Anaesthesiology 1987;66:832.
H, Bosenberg A, Marhofer P, et al. Ultrasonographic-guided
ilioinguinal/iliohypogastric nerve block in pediatric anesthesia: what
is the optimal volume? Anesth Analg 2006;102(6): 1680–1684.