To report on the anatomic variations of the lateral femoral cutaneous nerve
with respect to the ilioinguinal surgical dissection.
Cadaveric anatomic study.
Sixty-eight ilioinguinal dissections performed in fifty cadavers.
The lateral femoral cutaneous nerve
was identified, and certain location variables were recorded.
Main Outcome Measure:
The distance in millimeters from the medial edge of the anterior superior iliac spine (ASIS), whether the nerve
was lateral or medial to the ASIS, and the layer in which the nerve
crossed the dissection.
In seven dissections, the nerve
was twenty-one to twenty-five millimeters medial to the ASIS; in ten dissections, the nerve
was twenty-six to thirty millimeters from the ASIS; and in fourteen dissections, the nerve
was more than thirty millimeters medial to the superior border of the ASIS. The average medial distance from the ASIS was 20.4 millimeters, with a range of three to forty-six millimeters. In no specimen did the nerve
pass lateral to the ASIS. The lateral femoral cutaneous nerve
was found to lie anterior to the iliopsoas muscle in all specimens.
The course of the lateral femoral cutaneous nerve
is highly variable; the nerve
was most commonly found at ten to fifteen millimeters from the ASIS and as far medially as forty-six millimeters. When using the illioinguinal surgical approach, if the lateral femoral cutaneous nerve
is not encountered immediately adjacent to the ASIS, dissection up to five centimeters medial to the ASIS may be necessary to locate the nerve