Saratov JOURNAL of Medical and Scientific Research

biomechanical simulation

Optimization of the process of creating models of human blood vessels

Year: 2019, volume 15 Issue: №2 Pages: 353-357
Heading: Human anatomy Article type: Original article
Authors: Dol A.V., Ivanov D.V., Fomkina O.A.
Organization: Saratov National Research University n.a. N. G. Chernyshevsky, Saratov State Medical University
Summary:

Objective: to optimize the process of biomechanical modeling of blood vessels on the example of creating models of the arterial circle of the brain. Material and Methods. Biomechanical modeling requires the creation of a patient-oriented three-dimensional solid-state geometric model of the object under study. This problem can be solved by computer data processing (CT) or magnetic resonance (MRI) tomography. A program that implements the construction of blood vessel contours on individual sections of MRI in semi-automatic mode. These contours are exported as saved curves in a specifc format to SolidWorks, where they are used to create three-dimensional models of blood vessels. The models obtained in this way take into account the personal characteristics of the structure of the vascular bed of a particular patient and can be used in the process of biomechanical modeling. Results. The results of the program implementation of the recursive frontal growth method for processing two- dimensional slices of tomograms are presented. Conclusion. The developed software allows semi- automatic loading of DICOM images and obtaining fat sections of vessels on their basis, as well as transferring them for further processing into computer-aided design systems.

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Optimization of transpedicular spondylosynthesis application for type A3 lesions of the thoracolumbar transition: clinical experimental study

Year: 2019, volume 15 Issue: №2 Pages: 275-283
Heading: Traumatology and Orthopedics Article type: Original article
Authors: Likhachev S.V., Zaretskov V.V., Arsenievich V.B., Shchanitsyn I.N., Shulga A.E., Zaretskov A.V., Ivanov D.V.
Organization: Saratov National Research University n.a. N. G. Chernyshevsky
Summary:

Objective: the optimization of transpedicular systems application for type A3 lesions of the thoracolumbar transition using computer simulation based on the fnite elements method. Material and Methods. The examination data (post-traumatic kyphotic deformation, intensity of pain syndrome, length of operation and extent of blood loss) of 81 prospec-tively enrolled male patients who in 2017–2018 had been operated for Th11-L2 vertebrae simple fractures of А3N0M1 type (AOSpine classifcation). The patients were divided into 3 groups in accordance with the type of intervention performed on them: short-segment (n=42), 8-screws polysegment (n=25) and 6-screws polysegment (n=14). Biome-chanical simulation based on the computer tomography data was performed for each variant of the metal construction arrangement. Results. In the process of biomechanical simulation with all the variants of the instrumented spine 3D- models loading 8-screws construction proved to be the most consistent one, at that the stability of polysegmental constructions exceeds that of bisegmental one by an order. The results of surgical management were evaluated in terms of up to a year following the intervention. The loss was less and the correction worked better with polysegmental fxation despite more complicated initial conditions for the correction compared to those of group 1 Conclusion. Biomechanical simulation shows prerequisites for the development of bisegmental systems instability as the equivalent stresses and peak displacements are higher compared to those of polysegmental fxation. The efciency analysis of application of various transpedicular fxations for type A3 thoracolumbar transition lesions attests to the advantage of polysegmental arrangements of transpedicular systems, at that the implantation of the 6- screws polysegmental system should be considered the frst choice on the number of indices.

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