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Sciatic nerve entrapment in an osseous tunnel has only been reported twice previously. We describe a 19-year-old man evaluated for left lower limb pain and weakness that began one and one half years after sustaining stab wounds to the left buttock and midline back near the T11 vertebrae. The patient had sciatica and demonstrated motor and sensory deficits on physical exam. Electrodiagnostic studies demonstrated a localized injury to the sciatic nerve in the proximal thigh. Radiographic studies of the left pelvis and femur showed an 8 to 10cm linear opacification overshadowing the left femoral head and anatomic neck. An arteriogram of the left leg demonstrated a 3 x 4cm lobulated aneurysm arising from the distal portion of the inferior gluteal artery. Surgical exploration revealed the sciatic nerve to be encased in cylindrical bone. The ectopic bone was removed and the sciatic nerve released. The patient had gradual improvement with a nearly complete neurological recovery by three months after surgery.
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