Structural Analysis of Internal Fixation for fractured bone using locking compression plate ( LCP )

Abstract

Abstract The ability of bone to heal after the damage is both exceptional and amazing. Fractures can, however, occasionally fail to heal. Therefore, the repair of bone's structure, composition, and function is the main objective of fracture therapy. Devices for fixing fractures should create an ideal mechanical and biological environment for healing. The use of internal fixation provide less invasive method. The healing process depends on the mechanical stability of the fixationfractured bone complex. The degree of limb loading and the fixation device stiffness have major contribution to this stability. The goal of this research is to determine the fixation steadiness of an internal plate fixation device as well as the changes impact to its configuration upon the implant steadiness. The material properties of plate and screws (Stainless Steel or Titanium), and configuration has been represented by changing the plate offset to the bone, the working length, active plate length, screw number and screw spacing (Experimentally and numerically). In 3D stiffness the stiffness was increased when the implant material was changed from titanium to stainless steel. The direction of the moment about the (Y) axis had the most remarkable increase in stiffness (68%) by finite element analysis. In individual stiffness the stiffness was increased when the implant material was changed from titanium to stainless steel. The direction of the axial force in (Z axis) had the most remarkable increase in stiffness (60 %) by finite element analysis. In 3D stiffness, the stiffness was decreased when the implant was offset from the bone by 1mm, and 2mm. The direction of axial force had the most significant decrease in stiffness (44%, and 50 respectively) by finite element analysis. In individual stiffness, the stiffness was decreased when the implant was offset to the bone 1mm , and 2mm. The direction of axial force had the most significant decrease in stiffness (50 , 57 % respectively) by finite element analysis. In individual stiffness, the stiffness was decreased when the implant was offset to the bone 1mm, and 2mm. The direction of axial force had the most significant decrease in stiffness (40 , 50 % respectively) by experimental analysis. v when increasing the working length and the length of plate. The direction of shear force in the (Y) axis had the most significant decrease in stiffness (57%) by finite element analysis.In individual stiffness, all stiffness components were length of plate. The direction of axial force in the (Z) axis had the most significant decrease in stiffness (59%) by finite element analysis.In individual stiffness, all stiffness increasing the working length and the length of plate. The direction of axial force in the (Z) axis had the most significant decrease in stiffness (67%) by experimental analysis. Stiffness was increased when the implant material was changed from titanium to stainless steel. Also, all stiffness components were decreased when increasing the offset between the bone and the plate, and were decreased when increasing the working length and the length of plate.