Interfragmentary Modulus

Abstract

<b>Problem statement:</b> Youngs modulus and interfragmentary strain (ε_IF) are the important parameters in bone-plate testing and design. But Youngs modulus is not suitable when we use with ε_IF in the bone-plate testing. <b>Approach:</b> This research proposed a study on the Interfragmentary Modulus (IM) as the new parameter for the bone-plate testing. <b>Results:</b> The results from the FEM show that the relations of the interfragmentary stress (σ_IF) and interfragmentary strain are linear for all cases with the condition of the DCP and the screws material properties are linear and isotropic materials. <b>Conclusion:</b> IM are the constant values and we can use IM in the bone-plate testing

Effect of the Screw Torque Level on the Interfragmentary Strain and the Interfragmentary Modulus

“…Where: (3) M = Bending moment = We (e = distance from the body load to the centroid of the plate cross section area) σ b = Bending stress y = The distance from the centoid of the plate cross section area I = Moment of inertia of the plate cross section area Wongchai (2012) has defined the Interfragmentary Modulus (IM) as the slope of the graph between σ IF and ε IF when the are linearity related. The relation between σ IF and ε IF can be written as Equation 4 In the present work, the interfragmentary strain and the interfragmentary modulus is the goal to study at various bone screw torques level.…”

Study of the Interfragmentary Strain and the Interfragmentary Modulus With Changing the Distance Between Plate and Femur

“…The normal stress in the plate at fracture gab is the combine stress from normal stress and bending stress. For normal stress (Fouad, 2011), the equation of the normal stress is Equation 2 The Interfragmentary Modulus (IM) is defined as the slope of the graph between σ IF and ε IF if the graph is linear (Wongchai, 2012). The equation of the infragmentary modulus.…”