The biomechanical analysis for DHS and wire fixation osteoporotic and unstable femoral fracture

Osteoporotic patients occur frequently fragile fractures, and femoral fractures are the common traumatic injuries in the elderly. Although wires are often used through trials-and-errors for unstable femoral proximal fractures with DHS fixation clinically, there is no efficacy wire fixation technique available due to the lack of biomechanical study. FEM is applied to analyze the stress and strain distribution for Type A2.1 unstable proximal femoral fracture with DHS fixation only. This research is to investigate the biomechanical analysis for DHS and wire fixation on Type A2.1 unstable proximal femoral fracture (1) Fixation 1 used one wire to provide the lesser trochanter fragment fixation and operate easily; (2) Fixation 2 used two wire coils to fix the lesser trochanter fragment and to balance the muscle traction on lesser trochanter superior; and (3) Fixation 3 used two wire coils to fix the lesser trochanter fragment and balance the muscle traction on lesser trochanter superior and prevent lower wire slipping. The three developed wires fixations combined with DHS are potential to biomechanically enhance the stability through the wire fixation on lesser trochanter fragment leading to lower down the lag screw shaft load for Type A2.1 unstable proximal fracture.