*3.2. Mode of Failures*

All constructs in the SN group failed similarly and resulted in basicervical femoral neck fractures from the GT nail entry hole through the proximal oblique interlocking screw (Figure 3A). In the RN group, the five constructs failed without any femoral neck fractures; two constructs sustained subtrochanteric fractures through the reconstruction screw hole without any femoral neck fractures, whereas three constructs sustained subtrochanteric fractures with a non-displaced fracture line that extended toward the GT entry holes. One construct was observed to have subtrochanteric and basicervical femoral neck fractures (Figure 3B).

**Figure 3.** Failure modes after axial compressive loads. All constructs of group SN showed a basicervical femoral neck fracture from the GT nail entry hole through the proximal oblique interlocking screw (**A**). In the RN group reconstruction nail, five constructs exhibited a subtrochanteric fracture through the reconstruction screw hole, but without a femoral neck fracture (**B**). GT, greater trochanter. Red arrows point to the fracture lines.
