Comparative finite element analysis of the debonding process in different concepts of cemented hip implants.
Damage accumulation in the cement mantle and debonding of the bone-cement interface are basic events that contribute to the long-term failure of cemented hip reconstructions. In this work, a numerical study with these two process coupled is presented. Previously uniform bone-cement interface mechanical properties were only considered. In this work, a new approach assuming nonuniform and random bone-cement interface mechanical properties was applied to investigate its effect on cement degradation. This methodology was also applied to simulate and compare the degradation process of the cement and bone-cement interface in three different concepts of design: Exeter, Charnley, and ABG II stems. Nonuniform and random mechanical properties of the bone-cement interface implied a simulation closer to reality. The predicted results showed that the cement deterioration and bone-cement interface debonding is different for each implant depending on the stem geometry. Lower cement deterioration was obtained for the Charnley stem and lower bone-cement interface debonding was predicted for the Exeter stem, while the highest deterioration (cement and bone-cement interface) was produced for the ABG II stem.
Group of Structural Mechanics and Materials Modelling, Aragón Institute of Engineering Research (I3A), University of Zaragoza, 50018 Zaragoza, Spain. angeles@unizar.es
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D000268:Adhesiveness; D001843:Bone Cements / Q000737:chemistry*; D002484:Cementation / Q000379:methods*; D003198:Computer Simulation; D017076:Computer-Aided Design; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D006622:Hip Prosthesis; D008956:Models, Chemical; D011474:Prosthesis Design
D001843:Bone Cements