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Purpose: The paper presents the results of numerical analysis of expandable intramedullary nail – femur system in different states of healing. The aim of the research was to determine displacements, deformations and stresses occurring in a bone depending on the age of the patient and the extent level of osteoporosis. Design/methodology/approach: A femur was selected to numerical analysis. The analysis concerned the influence of the load and torsion of the system on the obtained results of displacements, deformations and reduced stresses. In order to make calculations, four models with different mechanical properties were chosen: model 1: femur with mechanical properties corresponding with a femur of a patient at the age of 16, model 2: with mechanical properties corresponding with a femur of a patient at the age of about 28, model 3: with mechanical properties corresponding with a femur of a patient at the age of about 20 and at the age of 50 to 65 years old and model 4: with mechanical properties corresponding with a femur of a patient at the age above 70 or with osteoporosis. For the chosen model of intramedullary nail, mechanical properties of titan alloy Ti-6Al-4V were used. Two load steps were analyzed: load step 1 in which simple axial load with a value ranging from 250 up to 1000 N simulating patient standing on one leg was used, and load step 2 – a torsion analyzing loads that the nail is exposed to while walking. Findings: Conducted analysis of the system showed the difference in displacements, deformations and reduced stresses depending on assumed mechanical properties of femur and load step of the system. Research limitations/implications: The limitations were connected with the necessity of simplifying the assumptions, which were associated with limitations caused by boundary conditions. In researches 4 forces loading the femur axially were used: 1: force F = 250N, 2: with force F = 500N, 3: with force F= 750N and 4: with force F = 1000N and 5 values of angle displacement of the femur head were assumed: 1: angle displacement ö = 1°, 2: ö = 5°, 3: ö = 10°, 4: ö = 15°, 5: ö = 20°. Practical implications: Obtained results can be applied in selection of stabilization methods of bone fragments and in forecasting biomechanical conditions depending on the age of patient and the state of his general conditions of bones. Originality/value: The paper presents the displacement-deformation-stress characteristics of femur - expandable intramedullary nail system, using the Finite Elements Method (FEM) in the analysis.
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Tom
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563--570
Opis fizyczny
Bibliogr. 18 poz., rys., tabl.
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autor
autor
autor
- Division of Biomedical Engineering, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland, wojciech.kajzer@polsl.pl
Bibliografia
- [1] M. Nałęcz, Biocybernetics and biomedical engineering. 2000. Vol 5: Biomechanics and rehabilitation engineering PAN Academic Publishing House EXIT, Warszawa 2004, 1-42, 291-304 (in Polish).
- [2] R. Będziński, Engineering biomechanics. Selected issues, Publishing House of Wroclaw Technical University, Wroclaw, 1997, 13-45 (in Polish).
- [3] Master thesis: M. Krykant (2006).
- [4] A. Kajzer, W. Kajzer, J. Marciniak, Numerical and experimental analysis of the new, expansion intramedullary nails.Engineering of Biomaterials 89-91/XII (2009)114-118.
- [5] A. Ziębowicz, A. Kajzer, W. Kajzer, J. Marciniak, Biomechanical analysis of metatarsal bone "I"- compression screws system. Engineering of Biomaterials 89-91/XII, (2009) 246 249.
- [6] W. Kajzer, A. Kajzer, J. Marciniak, FEM analysis of compression screws used for small bone treatment. Journal of Achievements in Materials and Manufacturing Engineering 33/2 2009) 189-196.
- [7] J. Marciniak, W. Chrzanowski, A. Krauze, Intramedullary nailing in osteosynthesis, Printing House of the Silesian University of Technology, Gliwice, 2006.
- [8] W. Walke, Z. Paszenda, J. Filipiak, Experimental and numerical biomechanical analysis of vascular stent, Proceedings of the 13th International Scientific Conference on "Achievements in Materials and Mechanical Engineering AMME'2005’, Gliwice-Wisła, 699-702.
- [9] W. Walke, Z. Paszenda, J. Filipiak, Experimental and numerical biomechanical analysis of vascular stent, Journal of Materials Processing Technology 164-165 (2005) 1263-1268.
- [10] F. Jaroszyk, Biophysics - students textbook Medical Publishing House PZWL, Warszawa, 2001, 413-429.
- [11] A. Krauze, J. Marciniak, Numerical method in biomechanical analysis of intramedullary osteosynthesis in children. Proceedings of the 11th International Scientific Conference CAM3S’2005 "Contemporary Achievements in Mechanics, Manufacturing and Materials Science”. Gliwice-Zakopane 2005, 528-533.
- [12] M. Kaczmarek, J. Marciniak, Issues of plate stabilizers for osteosynthesis Proceedings of the 3rd Scientific Conference “Materials, Mechanical and Manufacturing Engineering”, Gliwice-Wisła 2005, 325-334.
- [13] M. Kaczmarek, J. Marciniak, J. Szewczenko, A. Ziębowicz, Plate stabilizers in elastic osteosynthesis. Proceedings of the 11th International Scientific Conference CAM3S’2005 "Contemporary Achievements in Mechanics, Manufacturing and Materials Science”, Gliwice-Zakopane, 2005, 436-443.
- [14] A. Krauze, J. Marciniak, Numerical method in biome-chanical analysis of intramedullary osteosynthesis in children. Journal of Achievements in Materials and Manufacturing Engineering 15 (2006) 120-126.
- [15] J. Okrajni, M. Plaza, S. Ziemba, Validation of computer models of an artificial hip joint. Archives of Materials Science and Engineering, 28/5 (2007) 305-308.
- [16] W. Chrzanowski, J. Marciniak, Biomechanical analysis of the femoral bone-interlocking intramedullary nail system. Proceedings of the 18th European Conference on Biomaterials, 2003, Germany, 154.
- [17] J. Marciniak, W. Chrzanowski, M. Kaczmarek, Biomechanical analysis of femur-intramedullar nail system with the use of finite element method, Biomaterials Engineering 30-33 (2003) 53-55.
- [18] W. Chrzanowski, J. Marciniak, Biomechanical and biomaterial conditions in intramedullar osteosynthesis. Proceedings of the 3rd Scientific Conference “Materials, Mechanical and Manufacturing Engineering”, Gliwice-Wisła, 2005, 319-324.
Typ dokumentu
Bibliografia
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bwmeta1.element.baztech-article-BOS2-0021-0061