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Simultaneous bilateral femoral neck fractures (FNFs) are extremely rare and usually associated with an underlying condition affecting the bone quality and mineralization. Convulsions have also been described as a possible cause, mostly as a consequence of epilepsy, hyponatremia, and hypocalcemia. We present a 52-year-old female patient, with bilateral displaced FNFs due to a tonic-clonic seizure and high-dose steroid therapy related to a frontal lobe anaplastic oligodendroglioma brain tumor resection. Two days after admission, bilateral one-stage uncemented total hip arthroplasty (THA) under general anesthesia and through a posterolateral approach was performed using a metal-on-polyethylene bearing surface. Several risk factors can be identified in this unique case, such as the high-dose steroid therapy, the low-demand activity of the patient due to her functional sequelae, and finally, the convulsive episode. Surgeons should be aware of this uncommon injury to ensure early diagnosis and treatment in all patients with a previous history of seizures, chronic steroid use, severe hip pain, and inability to walk. For bone metabolic diseases, preventive measures should be indicated to avoid these complications. Bilateral one-stage uncemented THA represents an effective procedure with a low complication rate allowing early rehabilitation., (© 2020 The Authors.)