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Research Article

Optimization in Implant Topology to Reduce Stress Shielding Problem

M.I.Z. Ridzwan , Solehuddin Shuib , A.Y. Hassan , A.A. Shokri and M.N.M. Ibrahim
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Introducing an implant into a femur might reduce the natural stress distribution of the femur. The reduction could cause its density and volume shrinkage. The implant starts to loose and causes patients hardly to move, thus needed a revision surgery. The phenomenon of reduction in load was identified as stress shielding. Topology optimization method was employed in the analysis of model of implant, cement and femur in 3-dimension by using ANSYS 7.1. The objective of the optimization was to minimize implant compliance subjected to percentage of reduction in its initial volume (Vo) ranges from 30% up to 70% Vo. Results showed that implant with 50 or 60% Vo would produce closed boundary and hence were acceptable in shape. Both implants were compared in stress distribution with conventional implant and intact femur (without implant). Load transfer has increased in femur with the optimized implants compared to before optimize in medial and lateral side. Hence, it showed that the new optimized implants were better than the conventional implant in order to reduce stress shielding problem.

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  How to cite this article:

M.I.Z. Ridzwan , Solehuddin Shuib , A.Y. Hassan , A.A. Shokri and M.N.M. Ibrahim , 2006. Optimization in Implant Topology to Reduce Stress Shielding Problem. Journal of Applied Sciences, 6: 2768-2773.

DOI: 10.3923/jas.2006.2768.2773


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