In Silico Optimization of Femoral Fixator Position and Configuration by Parametric CAD Model

Abstract

Structural analysis, based on the finite element method, and structural optimization, can help surgery planning or decrease the probability of fixator failure during bone healing. Structural optimization implies the creation of many finite element model instances, usually built using a computer-aided design (CAD) model of the bone-fixator assembly. The three most important features of such CAD models are: parameterization, robustness and bidirectional associativity with finite elements (FE) models. Their significance increases with the increase in the complexity of the modeled fixator. The aim of this study was to define an automated procedure for the configuration and placement of fixators used in the treatment of long bone fractures. Automated and robust positioning of the selfdynamisable internal fixator on the femur was achieved and sensitivity analysis of fixator stress on the change of major design parameters was performed. The application of the proposed methodology is considered to be beneficial in the preparation of CAD models for automated structural optimization procedures used in long bone fixation.

Analysis of the Accuracy of CAD Modeling in Engineering and Medical Industries Based on Measurement Data Using Reverse Engineering Methods

“…The RE process is most often used in the automotive [15,16], aerospace [17,18], or archaeological [19,20] industries. It is also very often used in medicine, for example, in the process of developing the geometry of anatomical structures [21,22], designing surgical instruments [23][24][25], or implants [26]. However, errors arise at each stage of the geometric reconstruction process [12,27].…”

“…The hybrid modeling process in the CAD system is also a crucial stage. It is most often associated with shape approximation involving spline curves and splaying of non-uniform rational B-spline (NURBS) surfaces, allowing a surface model to be obtained [22,29,31]. The last stage is usually a solid modeling process.…”

Evaluation of the accuracy of the resection template and restorations of the bone structures in the mandible area manufactured using the additive technique

“…Reverse engineering is used in many fields, including the aviation industry (Fedorova et al, 2019), and architecture (Raja and Fernandes, 2007), Kumar et al (2013). It is also often used in medicine -e.g., in reconstructing the geometry of anatomical structures (Cohen et al, 2009;Stojkovic et al, 2018;Turek, 2019;Vitkovic, 2021), designing surgical templates (Ciocca et al, 2012;Liu et al, 2014), implants (Figliuzzi et al, 2012;Orabona et al, 2018;Korunovic et al, 2019;Stojković, 2022), and scaffolds (Milovanović et al, 2020).…”