BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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64 Marius Catană and Daniela Tarniţă eqhilibrum position, the maximum calculated Von Misses stress of 13.8 MPa occurs near to the femural proximal head (Fig. 6). The non-linear analysis emphasised the Von Missed stress in the cartilages of femur (Fig. 7) and of tibia (Fig. 8), the stresses due to contact pressures being uniformed distributed. The values of the stresses at the cartilages levels are in the limits reported by others outhors. The maximum strain due to compression forces in the cartilages (Fig. 10) and meniscus (Fig. 9) is 10%, also this is in the limits reported by others. Fig. 5 – a – total displacement; b – lateral displacement. Fig. 6 – a – on Misses Stress; b – femur Stress. Fig. 7 – stress for femoral cartilage. Fig. 8 – stress for tibia cartilage. Fig. 9 – left – stress for the medial meniscus; right – stress for the lateral meniscus. Fig. 10 – The compression strains for femur and tibia cartilages.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 3, 2012 65 4. Conclusions 1. It is necessary to developing reliable standard finite element models of the human knee joint. In developing such models, the first step is to generate computer models of the bones of the knee joint. 2. A standard finite element model of the knee model will help surgeons and biomechanical researchers develop improved implants and treatment method for patients suffering bone loss and diseases. 3. Additionally, the finite element model used in the present study, characterized by a solid hexahedral element mesh, was able to analyse the stress in the purpose of validating mechanical and material properties of bone. 4. Finite Element Modelling based on continuum mechanics is a very powerful instrument in predicting the behaviour of ligaments. 5. However, the construction and validation of models is very difficult due to the fact that ligaments are nonlinear, anisotropic, viscoelastic, porous media and inhomogeneous. 6. Ligaments also undergo large deformations when loaded. 7. It is important to determine the effect of various factors such as a misalignment, overlap, etc., which could cause erosion of the cartilage. 8. It is important to analyze the components of 3D tibia and femur to be considered deformable bodies, and the main objective to be closely following the destruction of cartilage and detection of different factors that can cause these changes. Acknowledgements. This work was supported by the strategic grant POSDRU/CPP107/DMI1.5/S/78421, Project ID 78421 (2010), co-financed by the European Social Fund – Investing in People, Sectoral Operational Programme Human Resources Development 2007 – 2013. REFERENCES Bae Y.J, Kyung S.P., Jong K.S., Dai S.K., Biomechanical Analysis of the Effects of Medial Meniscectomy on Degenerative Osteoarthritis. Med. Biol. Eng. Comput. 50, 53-60 (2012). Bahraminasaba M., Saharia B.B., Roshdi H., Arumugamc M., Shamsborhand M., Finite Element Analysis of the Effect of Shape Memory Alloy on the Stress Distribution and Contact Pressure in Total Knee Replacement, Trends Biomater Artif. Organs, 25, 3, 95-100 (2011). Bingham J.T., Papannagari R., Van de Velde S. K., Gross C., Grill T. J., Felson D. T., Rubash H. E., Li G., In Vivo Cartilage Contact Deformation in the Healthy Human Tibiofemoral Joint. Rheumatology; 47, 1622-1627 (2008). Fening D.S., The Effects of Meniscal Sizing on the Knee Using Finite Element Methods. College of Engineering and Technology of Ohio University, 2005. Harrysson O.L., Yasser A Hosni Y.A., Nayfeh J.F., Custom-designed Orthopaedic Implants Evaluated Using Finite Element Analysis of Patient-specific Computed Tomography Data: Femoral-component, Case Study. BMC Musculoskeletal Disorders, 8, 91 (2007).
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BULETINUL INSTITUTULUI POLITEHNIC D
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