Analysis of Stress-Strain State of the Distal Tibia and Foot in Pilon Injuries Under External Fixation using Rod Devices

I.V. Stoyko, V.G. Bats, М.Yu. Karpinsky, I.G. Bats


The purpose of the study — to identify opportunities for the application of rod devices for extrafocal osteosynthesis in pilon injuries and to install the most appropriate structure for this localization of injury. To do this, in the laboratory of biomechanics of State institution «Institute of Spine and Joint Pathology named after professor M.I. Sitenko of Academy of Medical Sciences of Ukraine» we used an analysis of the stress-strain state of the distal tibia and ankle joint in the health and under extrafocal fixation with various types of rod devices in pilon fractures. Analysis was performed using finite element method, which allows you to fully take into account the geometric and physical design features, as well as to provide a complete picture of the load, to carry out an objective comparison of methods and devices for fixation of fractures, to assess their advantages and disadvantages.
The study was conducted on a solid three-dimensional model of the distal tibia and ankle joint using three-dimensional finite element model. The calculations were performed using BioCad calculation program and visualization program Looker.
As a result, we revealed the most loaded areas of studied anatomic area in the health and load distribution in terms of extrafocal fixation in pilon fractures. It is proved that use of rod unilateral devices in pilon fractures is possible theoretically, as it provides unloading damaged anatomic area under axial loads within the borders of half the mass of the human body, there were identified construction of devices, which should be preferred.


fractures of the distal epimetaphysis of tibial bones (pilon fractures); surgical treatment; extrafocal osteosynthesis; rod devices; finite element method


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