Sciatic Neuropathy

The sciatic nerve arises from the sacral portion of the plexus. It leaves the pelvis through the sciatic notch and divides into the tibial and peroneal nerves at the popliteal fossa. The sciatic nerve provides sensation to the perineum, posterior thigh, lateral calf, and foot. It innervates the thigh extensors, hamstrings, and all the muscles of the lower leg and foot. Pain, weakness, and sensory changes caused by injury of the sciatic nerve or one of its two branches can be caused by trauma from gunshots, hip fracture or dislocation, compression from surgery or prolonged sitting on a hard edge, tumor, endometriosis, lipoma, aneurysm of the gluteal artery, or improper intramuscular injection into the gluteus. Symptoms of sciatic nerve compression can mimic L5-S1 radiculopathy. Again, EMG is helpful in these clinical situations.

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