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Analysis of Mechanical Properties of External Unilateral Fixation Device in the Case of Torque Load

100%

Pervan N. , Muminović A. J. , Delić M. , Muratović E.

Advances in Science and Technology. Research Journal

2023

tom Vol. 17, no 3

31--39

Analysis of mechanical properties of external unilateral fixation device „Ultra X“, in the case of torque load, is presented in this paper. Fixation device is applied on lower leg in the case of unstable fracture. Computer aided design (CAD) model and finite element model (FEM) are developed according to the dimensions and material properties of real fixation device. In the next step principal stress and deformation analysis is performed in CATIA V5 software. During numerical analysis values of stresses at critical places are monitored and analyzed. In addition, values of displacements are measured on important places on fixation device and bone fracture. Using values of displacements at the place of bone fracture, stiffness of the fracture is calculated. The same methodology is used to calculate stiffness of the fixation device. Using obtained results, several conclusions about the mechanical properties of the fixation device “Ultra X” are formulated at the end of the paper.

Stiffness Analysis of the External Fixation System at Axial Pressure Load

88%

Pervan N. , Mešić E. , Muminović A. J. , Delić M. , Muratović E.

Advances in Science and Technology. Research Journal

2022

tom Vol. 16, no 3

226--233

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.