Mathematical Modeling of the 'Bone-Fixator' System during the Treatment of Intertrochanteric Fractures
| Autor: | I. M. Shcherbakov, D. V. Yashin, D. A. Zyuzin, K. A. Saprykina, I. A. Kuz’kin, V. E. Dubrov |
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| Rok vydání: | 2019 |
| Předmět: |
Orthopedic surgery
Orthodontics Materials science Osteosynthesis Consolidation (soil) trochanteric fractures finite element analysis dynamic cephalomedullary osteosynthesis Stress (mechanics) Fixation (surgical) medicine.anatomical_structure medicine Fracture (geology) Femur Ao classification RD701-811 Femoral neck |
| Zdroj: | Travmatologiâ i Ortopediâ Rossii, Vol 25, Iss 1, Pp 113-121 (2019) |
| ISSN: | 2542-0933 2311-2905 |
| DOI: | 10.21823/2311-2905-2019-25-1-113-121 |
| Popis: | Relevance — the need for an objective justification in choosing the type of fixation in the treatment patients with pertrochanteric hip fractures. Objective — to study the changes in the properties of a consolidating trochanteric fracture fixed by a dynamic cephalomedullary nail when subjected to cyclic dynamic loads. Materials and methods . A mathematical model was developed for trochanteric fracture of the femur (A1 according to AO classification) when fixed with a dynamic cephalomedullary nail. Then, the properties of the system were studied (pressure between fragments, mechanical stress in the bone and fixation device, displacement amplitude, neck-diaphysis angle) under a virtual load of a 80 kg body at various amount of insertion of the dynamic screw (from 10 mm to 0 mm). Results . In the process of shortening the femoral neck axis by 1 cm, the stability of the ‘bone-metal fixation device’ system increases, as indicated by a decrease in the maximum amplitude of displacements in the system under load by 16.8%, a decrease in the maximum stress in the fixation elements by 20.2%, a decrease in pressure at the site of contact of fragments by 19.8%. In addition, there was a decrease in the neck-diaphysis angle by 2.8%. Conclusion. The mathematical modeling of the ‘bone-metal fixation device’ system simulating conditions of dynamic osteosynthesis showed that there is a potential increase in the stability of the cephalomedullary system and that favorable conditions are created for the consolidation of the fracture when subjected to cyclic load of body mass. |
| Databáze: | OpenAIRE |
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