Fig. (3) Average tension (green) and compression (blue) longitudinal stress components σz for not fractured femur, both in the unplated (grey) and in kissing and overlapped plates configurations (stainless steel (a, c) and titanium alloy (b, d), healthy (a, b) and osteoporotic bone (c, d) during heel-strike phase, in the five cross sections chosen. The orange lines highlight the stresses trend along the diaphyseal axis of the femur in the different configurations.