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Biomechanical Finite Element Analysis of Bone Cemented Hip Crack Initiation According to Stem Design  

Kim, Byeong-Soo (Department of Mechanical and Atomobile Engineering, Inje University)
Moon, Byung-Young (Industrial Liaison Innovation Cluster, Pusan National University)
Park, Jung-Hong (Department of Mechanical Design Engineering, Pusan National University)
Publication Information
Journal of Mechanical Science and Technology / v.20, no.12, 2006 , pp. 2168-2177 More about this Journal
Abstract
The purpose of this investigation was to determine the specific fracture mechanics response of cracks that initiate at the stem-cement interface and propagate into the cement mantle. Two-dimensional finite element models of idealized stem-cement-bone cross-sections from the proximal femur were developed for this study. Two general stem types were considered; Rectangular shape and Charnley type stem designs. The FE results showed that the highest principal stress in the cement mantle for each case occurred in the upper left and lower right regions adjacent to the stem-cement interface. There was also a general decrease in maximum tensile stress with increasing cement mantle thickness for both Rectangular and Charnley-type stem designs. The cement thickness is found to be one of the important fatigue failure parameters which affect the longevity of cemented femoral components, in which the thinner cement was significantly associated with early mechanical failure for shot-time period.
Keywords
Total Hip Replacement; Bone Cement; Femoral Stem; Crack Propagation; Finite Element Method; Biomechanics;
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