DOI: https://doi.org/10.15674/0030-59872019218-26
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Computer simulation and field study of the stress-strain state of the biomechanical system «fixator-bone» at supramalleolar corrective osteotomies

Taras Omelchenko, Oleksandr Buryanov, Andriy Lyabakh, Mykola Shidlovkiy, Viktor Yeshchenko, Mariana Dyman

Abstract


Objective: to study the stability of internal fixation at various types of the supramalleolar corrective osteotomies of the distal tibia bone. To examine the parameters of stiffness and durability of the «fixator-bone» systems at computer simulation by finite elements method; to assess the adequacy of this method by comparisons with the results of field full-scale studies.

Methods: the 3D distal tibia bone model is based on the CT of an intact tibia in the ANSYS software package. In-situ study we used 5 intact distal tibia bone species of dead people. In the models we recreated supramalleolar corrective osteotomies specified zones with fixation with various blocked plates with angular stability.

Results: systems with medial blocked «puddi-plate» and anterior lateral blocked L-shaped plates had the highest stiffness and stability. The allowable efforts for compression were 217 and 308 N, for bending — 34 and 73 N, for torsion — 18.8 and 17.9 N/m, respectively. The smallest compressive stiffness (151 N), bending (19 N) and torsion (2.46 N/m) were found at a medial blocked plate. Similar distribution of maximal static and cyclic loads was obtained in full-scale bench research.

Conclusions: the adequacy of imitation 3D-models and parameters of biological materials incorporated in them was confirmed. In the case of a medial supramalleolar corrective osteotomies with an open wedge, the medial blocked plate «puddi-plate» provided the greatest stability and rigidity of fixation. For lateral supramalleolar corrective osteotomies with closed wedge and anterior focal dome correcting osteotomies — optimally used anterior-lateral L-shaped blocked plate.


Keywords


supramalleolar corrective osteotomy; ankle joint; computer simulation; full-scale bench research

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Copyright (c) 2019 Taras Omelchenko, Oleksandr Buryanov, Andriy Lyabakh, Mykola Shidlovkiy, Viktor Yeshchenko, Mariana Dyman

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