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We present a case of a 34-year-old white female patient who, 13 years ago, sustained a pathological intracapsular femoral neck fracture on a pre-existing aneurysmal bone cyst. Three months later radiographic and magnetic resonance imaging evaluation revealed both femoral neck fracture and stage IV osteonecrosis of the femoral head according to Steinberg classification system. Management was accomplished with combined free vascularized fibular grafting and internal osteosynthesis with a 130° blade plate. Union was achieved in 7 months. Progression of osteonecrosis was arrested. Hip salvage and a satisfactory subjective and clinical outcome were achieved. At the last follow-up, 13 years postoperatively, the patient had satisfactory functional outcome.