Group of Structural Mechanics and Materials Modelling, Aragón Institute of Engineering Research (I3A), University of Zaragoza, 50018 Zaragoza, Spain.
Ann Biomed Eng. 2010 Jun;38(6):2093-106. doi: 10.1007/s10439-010-9996-3. Epub 2010 Mar 16.
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.
水泥覆盖层的损伤积累和骨-水泥界面的脱粘是导致骨水泥髋关节重建长期失效的基本事件。在这项工作中，提出了一种将这两个过程耦合的数值研究。以前只考虑了均匀的骨-水泥界面力学性能。在这项工作中，应用了一种新的方法，假设非均匀和随机的骨-水泥界面力学性能，以研究其对水泥降解的影响。该方法还应用于模拟和比较三种不同设计概念（ Exeter 、 Charnley 和 ABG II 柄）中水泥和骨-水泥界面的降解过程。非均匀和随机的骨-水泥界面力学性能意味着模拟更接近实际情况。预测结果表明，根据柄的几何形状，每种植入物的水泥劣化和骨-水泥界面脱粘情况都不同。 Charnley 柄的水泥劣化程度较低， Exeter 柄的骨-水泥界面脱粘程度较低，而 ABG II 柄的水泥和骨-水泥界面的劣化程度最高。
