In this report, we describe the case of a healthy 37-year-old male patient without a history of disease, who developed atraumatic bilateral fracture of the femoral neck. Radiological and blood investigations revealed osteopenia and severe vitamin D deficiency (7.42 ng/mL), respectively, but patient had no apparent risk factors for insufficiency fracture. Bilateral osteosynthesis was obtained using cannulated screws and laboratory findings improved after vitamin D supplementation. This case highlights the effect of vitamin D deficiency on demineralization in a young male patient.