Comparison of fatigue behaviour of eight different hip stems: a numerical and experimental study
Makaleler > Tam Makale · 2011
Yazarlar: Mahmut PEKEDİS
Journal of Biomedical Science and Engineering, Diğer Kurumların Hakemli Dergileri, Uluslararası, Scopus, 2011, cilt 31, ss 643-650
Özet
<p><strong>n this study, finite element analysis was used to in-</strong></p><p><strong>vestigate the fatigue behavior of eight different hip</strong></p><p><strong>stems. All of the prostheses investigated in the analy-</strong></p><p><strong>sis are already being used in Turkish orthopaedic</strong></p><p><strong>surgery. All stems were compared with each other in</strong></p><p><strong>terms of fatigue, deformation and safety factors.</strong></p><p><strong>Primary analysis was applied on three of the stems,</strong></p><p><strong>which were tested experimentally. It was observed</strong></p><p><strong>that the simulation and the experimental results are</strong></p><p><strong>in good agreement with each other. After determining</strong></p><p><strong>the reliability of the numerical method, the analysis</strong></p><p><strong>was applied on all other stems. To obtain a more re-</strong></p><p><strong>alistic simulation, boundary conditions were applied</strong></p><p><strong>according to standards specified in the ISO 7206-4</strong></p><p><strong>standard. Three different types of materials were</strong></p><p><strong>selected during analysis. These materials were Ti-</strong></p><p><strong>6Al-4V, cobalt chrome alloy and 316L. Minimum fa-</strong></p><p><strong>tigue cycles, critical fatigue areas, stresses and safety</strong></p><p><strong>factor values have been identified. The results ob-</strong></p><p><strong>tained from the finite element analysis showed that</strong></p><p><strong>all stems were safe enough in terms of fatigue life. As</strong></p><p><strong>a result of fatigue analysis, all stems have been found</strong></p><p><strong>to be successful, but some of them were found to be</strong></p><p><strong>better than the others in terms of safety factor. The</strong></p><p><strong>current study has also demonstrated that analysing</strong></p><p><strong>hip stems with the finite element method (FEM) can</strong></p><p><strong>be applied with confidence to support standard fa-</strong></p><p><strong>tigue testing and used as an alternative. Further</strong></p><p><strong>studies can expand the simulations to the clinical</strong></p><p><strong>relevance due to complex physical relevance.</strong></p><p><strong>Keywords: </strong>Hip Stem; Fatigue; The Finite Element</p><p>Method</p>