R. Blomfeldt, H. Törnkvist, S. Ponzer, A. Söderqvist, and J. Tidermark, “Displaced femoral neck fracture: comparison of primary total hip replacement with secondary replacement after failed internal fixation: A 2-year follow-up of 84 patients”, ActaO, vol. 77, no. 4, pp. 638–643, Jan. 2006.