PSI - Issue 13

Milena Babić et al. / Procedia Structural Integrity 13 (2018) 438 – 443 E. D. Pasiou, S. K. Kourkoulis , M. G. Tsousi, Ch. F. Markides/ Structural Integrity Procedia 00 (2018) 000 – 000

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5. Conclusion The aim of this study was to analyze the influence of debonding of the prosthesis femoral component shaft and femoral bone on stresses in the femoral component, and consequently its influence on the fatigue life. The study has shown that in a newly implanted prosthesis, maximum stresses appear under the collar of the femoral component of the prosthesis. In cases of loosened femoral component tensile stresses appear on the lateral side, and compressive stresses appear on the medial side on the upper part of the prosthesis shaft. This can lead to damage accumulation and crack initiation at the stress concentration sites, which can subsequently lead to fracture of the prosthesis. This is in good agreement with practical experience reported in the literature. References Akahori, T., Niinomi, M., 1998. Fracture characteristics of fatigued Ti-6Al-4V ELI as an implant material. Materials Science and Engineering A243, 237-243. Andriacchi, T. P., Hurwitz, D. E., 1997. Gait biomechanics and the evolution of total joint replacement. Gait and Posture 5, 256-264. Bergmann, G., Deuretzbacher, G., Heller, M., Graichen, F., Rohlmann, A., Strauss, J., Duda, G. N., 2001. Contact forces and gait patterns from routine activities. Journal of Biomechanics 34, 859-871. Byrne, D. P., Baker, J. F., 2010. Anatomy & Biomechanics of the Hip. The Open Sports Medicine journal, 51-57. Capitanu, L., Florescu, V., Badita, L.L., 2012. About failure uncemented hip replacements from fracture stem prosthesis. Journal of Biomechanics 45(S1). Chalernpon, K., Aroonjarattham, P., Aroonjarattham, K., 2015. Static and Dynamic Load on Hip Contact of Hip Prosthesis and Thai Femoral Bones. International Journal of Mechanical and Mechatronics Engineering 9(3), 251-255. Griza, S., Kwietniewski, C., Tarnowski, G. A., Bertoni, F., Reboh, Y., Strohaecker, T. R., Rabin Baumvol, I. J., 2008. Fatigue failure analysis of a specific total hip prosthesis stem design. International Journal of Fatigue 30, 1325-1332. Hernandez-Rodriguez, M. A. L., Ortega-Saenz, J. A., Contreras-Hernandez, G. R., 2010. Failure analysis of a total hip prosthesis implanted in active patient. Journal of the Mechanical Behavior of Biomedical Materials 3, 619-622. Joshi, M. G., Advani, S. G., Miller, F., Santare, M. H., 2000. Analysis of a femoral hip prosthesis designed to reduce stress shielding. Journal of Biomechanics 33, 1655-1662. Marker, D. R., Zywiel, M. G., Johnson, A. J., Seyler, T. M., Mont, M. A., 2010. Are component positioning and prosthesis size associated with hip resurfacing failure?. BMC Musculoskeletal Disorders 11. Mierzejewska, Z.A., Oksiuta, Z., 2014. Failure analysis of a femoral hip stem made of stainless steel after short time of exposure. Acta mechanica et automatic, vol.8 no.3, 146-150. Ruszkowski, I., Orlić, D., Muftić, O., 1985. Endoproteza zgloba kuka. Jugosla venska medicinska naklada, Zagreb. Vakulenko, A., 2014. 3D Scanning Improves Prosthetic Design. Medical Design Technology Magazine.