Ultrasound guided injection of the lateral cutaneous nerve of thigh

Anatomical landmark:
1 inch (2.5 cm) medial and inferior to ASIS

Ultrasound identification:
Keep the probe transverse just below the anterior superior iliac spine (ASIS)
Sweep medially and inferiorly
No probe pressure (otherwise the two fasciae collapse)
Lateral femoral cutaneous nerve is seen between fascia lata and fascia iliaca. fascia iliaca is superficial to sartorius
Commonly found approximately 10-25 mm medial and 45-85 mm inferior (average 2 inch/ 5 cm) to ASIS, and 6 mm (5-7 mm) deep to the skin

Ng I, Vaghadia H, Choi PT, Helmy N.Ultrasound imaging accurately identifies the lateral femoral cutaneous nerve.Anesth Analg. 2008 Sep;107(3):1070-4.