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Finite Element Analysis of Bone Healing with Variable Fixation Locking Screws in Femoral Fracture Osteosynthesis.
Rel. Mara Terzini, Alessandra Aldieri, Federico Andrea Bologna. Politecnico di Torino, Master of science program in Mechanical Engineering, 2025
Abstract
Femoral shaft fractures are among the most common long bone injuries, and their successful treatment requires a balance between mechanical stability and biological healing. While conventional locking screws provide rigid fixation, they may limit the micromotion necessary for callus formation. This study evaluates the mechanical performance of a hybrid fixation strategy employing Variable Fixation Locking Screws (VFLS) and conventional Locking Screws (LS) for stabilizing simple transverse femoral fractures. Using ANSYS, a finite element model was created to simulate a femoral shaft with a 2 mm fracture gap. The construct included four Variable Fixation Locking Screws (VFLS) in the proximal fragment and four standard Locking Screws (LS) distally.
To simulate progressive degradation of the PLGA sleeve in the VFLS design, the Young’s modulus was reduced in stages: 100%, 75%, 50%, 25%, and 0%
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