The LFCN is a purely sensory nerve supplying the anterolateral thigh. Its compression under the inguinal ligament near the ASIS produces meralgia paraesthetica — burning, tingling, and numbness of the anterolateral thigh worsened by standing and hip extension. Common in pregnancy, obesity, tight belts, and diabetes.
| Origin | Lumbar plexus (L2, L3) from the posterior divisions |
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Meralgia paraesthetica from LFCN compression is diagnosed clinically by the dermatomal distribution of symptoms and reproduction by pressing over the ASIS-inguinal ligament junction. Conservative management (weight loss, loose clothing, nerve blocks) resolves most cases. Surgical release or neurectomy for refractory cases. Importantly, it has no motor component — quadriceps strength and the patellar reflex are completely preserved, distinguishing it from femoral neuropathy.
LFCN compression at the inguinal ligament producing anterolateral thigh burning and numbness without motor deficit managed with activity modification, weight loss, and nerve block.
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