This study presents a comparative biomechanical finite element analysis (FEA) of a human femur bone under three configurations: (1) a healthy, intact femur, (2) a fractured femur stabilized with an intramedullary interlocking nail (Implant 1), and (3) a fractured femur stabilized with a bone fixation plate (Implant 2). A three-dimensional femur geometry, reconstructed from scan data, was modelled in SolidWorks 2026 and imported into ANSYS Workbench (Student 2026 R1) for static structural analysis. The bone was assigned isotropic linear-elastic material properties (Nylon 66) as a simplified surrogate for cortical bone, while the implant components were modelled using Titanium alloy Ti-6Al-7Nb. A static axial load of 700 N, representative of physiological body-weight loading through the hip joint, was applied at the femoral head with the distal (knee) end fully constrained. Equivalent (von-Mises) stress, equivalent elastic strain, and total deformation were evaluated for each configuration. Results show that the healthy femur exhibited a maximum total deformation of 10.195 mm and a maximum equivalent stress of 13.91 MPa, whereas the fractured femur stabilized with the intramedullary nail exhibited a maximum deformation of 1.145 mm, with a maximum equivalent stress of 25.79 MPa. The fractured femur stabilized with the bone plate exhibited a maximum deformation of 2.348 mm, a maximum equivalent elastic strain of 1.2414×10⁻³ mm/mm, and the largest maximum equivalent stress of 113.31 MPa. These results quantify the different load-transfer responses produced by the two fixation configurations and identify regions of elevated stress and deformation relevant to implant design and placement.

Index Terms—Femur fracture, Finite Element Analysis, Intramedullary nail, Bone plate, Biomechanics, Ti-6Al-7Nb, ANSYS, Orthopedic implant