Albareda-Albareda, J. Gabarre-Raso, S. Rosell-Pradas, J. Puértolas-Broto, S. Ibarz-Montaner, E. Redondo-Trasobares, B. Gómez-Vallejo, J. Blanco-Rubio, N. Sánchez-Gimeno, M. Herrera-Rodríguez, A. Gracia-Villa, L. Biomechanical behavior of retrograde intramedullary nails in distal femoral fractures Injury 10.1016/j.injury.2021.01.052 2021 2021