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The Impact of Geometry on the Mechanical Stability of Plates for Internal Bone Fixation

Pervan Nedim, Mešić Elmedin, Metović Sađit, Muminović Adis J., Lulić Haris

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 4

262--270

EN

The aim of this work is to investigate the impact of geometry on the mechanical stability of characteristic structural solutions of plates for internal bone fixation using the finite element method (FEM). Based on the realistic construction of plates for internal bone fixation, 3D geometric and FEM models were formed, and then structural analysis was carried out in the CAD/CAE system CATIA V5. Five different types of plates for internal bone fixation were tested under two types of loads: axial pressure and torque in the case of application to the femur. During the structural analysis, stresses and displacements were monitored at characteristic points of the structure. The most attention was paid to the relative displacements of the bone model fragments, because the stiffness of the plates for the internal fixation of the bone was determined based on them. At the end of the paper, the results of all analyzed plates are presented, their mutual comparison as well as the conclusion in which, based on everything done, it was stated which plate would be the most favorable solution for a given case of bone fracture.

2

Stiffness Analysis of the External Fixation System at Axial Pressure Load

Pervan Nedim, Mešić Elmedin, Muminović Adis J., Delić Muamer, Muratović Enis

Advances in Science and Technology. Research Journal

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2022

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Vol. 16, no 3

226--233

EN

The paper analyzes the stiffness of the Orthofix external fixation system at axial pressure load, applied to the lower leg in case of an unstable fracture. Based on the actual construction of the Orthofix fixator, its 3D model was formed, and then a structural analysis was performed in the CATIA V5 software system. The aim of this paper is to investigate the mechanical properties of Orthofix fixator. FEM analysis of the fixator revealed displacements at characteristic points of the structure and fractures. During the FEM analysis, it is possible to change the load values, all with the aim of obtaining the best possible information about the behavior of the fixator during installation and use by the patient. Based on the results obtained from the FEM analysis, it can be concluded that the Orthofix fixative shows very good stiffness, but also that it can be improved by using newer materials, such as composite or some alloys of titanium and aluminum.

3

Analysis of Mechanical Stability for External Fixation Device in the Case of Anterior-Posterior Bending

Pervan Nedim, Muminović Adis J., Mešić Elmedin, Delić Muamer, Muratović Enis

Advances in Science and Technology. Research Journal

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2022

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Vol. 16, no 3

136--142

EN

Analysis of mechanical stability for external fixation device Orthofix in the case of anterior-posterior bending is carried out in this paper. Device is applied to the lower leg for the case of unstable fracture. Real device is measured and 3D CAD model is developed. CAD model is used for numerical structural stress analysis which is carried out using CATIA V5 software. Results for displacements are obtained for selected critical places on the device and for the place of fracture. In addition, values of principal and von Misses stresses are obtained and analyzed. Using obtained results, conclusions about mechanical stability of device are formulated.

4

Structural Size Optimization of External Fixation Device

Mešić Elmedin, Muminović Adil, Čolić Mirsad, Petrović Marin, Pervan Nedim

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 2

233-240

EN

Structural size optimization of a device for external bone fixation within a formed iterative hybrid optimization algorithm was presented in this paper. The optimization algorithm was in interaction with the algorithms for generative design and FEM analysis and completely integrated within CATIA CAD/CAM/CAE system. The initial model, representing the current design of the bone external fixation device Sarafix, was previously verified by experimental testing. The formed hybrid optimization algorithm was created as an integration of the global (SA method) and local (CG method) algorithm. The constraints of the optimization model are the clinical limitations of the interfragmentary displacements and the material strength. The optimized design has less weight, greater rigidity and less transverse interfragmentary displacements at the point of fracture compared to the current design.