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The finite element models (a, b) PFNA-II and A2FN implants fixing the femur models; (c) FE model of the elderly femur with the element-by-element material properties; (d) the femoral neck load carrier (PFNA-II blade/A2FN screws). Three different contact conditions in the bone-implant-construct (1 = contact elements, 2 = sharing common nodes, and 3 = coupling nodes' degree of freedom).
