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Journal of Applied Sciences

Year: 2006 | Volume: 6 | Issue: 13 | Page No.: 2768-2773
DOI: 10.3923/jas.2006.2768.2773
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

Abstract: 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.

Keywords: Stress shielding, topology optimization method, hip prosthesis and finite element analysis

REFERENCES
  • Fernandes, P.R., J. Folgado, C. Jacobs and V. Pellegrini, 2002. A contact model with ingrowth control for bone remodeling around cement less stems. J. Biomech., 35: 167-176.

  • Fujii, D. and N. Kikuchi, 2000. Improvement of numerical instabilities in topology optimization using the SLP method. Struct. Multidisciplinary Optimizat., 19: 113-121.

  • Gross, S. and E.W. Abel, 2001. A finite element analysis of hollow stemmed hip prostheses as a means of reducing stress shielding of the femur. J. Biomech., 34: 995-1003.
    Direct Link    

  • Huiskes, H.W.J., H. Weinans and B. van Rietbergen, 1992. The relationship between stress shielding and bone resorption around total hip stems and the effects of flexible materials. Clin. Orthopaedics, 274: 124-134.
    Direct Link    

  • Joshi, M.G., S.G. Advani, F. Miller and M.H. Santare, 2000. Analysis of a femoral hip prosthesis designed to reduce stress shielding. J. Biomech., 33: 1655-1662.
    Direct Link    

  • Kosaka, I., C. Charpentier and B.C. Watson, 2000. An interface between SDRC I-DEAS and the GENESIS structural analysis and optimization code. AIAA/USAF/NASA/ISSMO 8th Symposium on Multidisciplinary Analysis and Optimization, Sept. 6-8, Long Beach, CA.

  • Kuiper, J.H., 1993. Numerical optimization of artificial hip joint designs. Ph.D. Thesis, Katholieke Universiteit Nijmegen.

  • Lennon, A.B., B.A.O. McCormack and P.J. Prendergast, 2003. The relationship between cement fatigue damage and implant surface finish in proximal femoral prostheses. Med. Eng. Phys., 25: 833-841.

  • Li, C., C. Granger, H.D. Schutte, S.B. Biggers, J.M. Kennedy and R.A. Latour, 2003. Failure analysis of composite femoral components for hip arthroplasty. J. Rehabil. Res. Dev., 40: 131-146.

  • Morscher, E.W. and W. Dick, 1983. Cement less fixation of isoelastic hip endoprostheses manufactured from plastic materials. Clin. Orthopaedics, 176: 77-87.

  • Munting, E. and M. Verhelpen, 1995. Fixation and effect on bone strain pattern of a stemless hip prosthesis. J. Biomech., 28: 949-961.

  • Pedersen, C.B.W., T. Buhl and O. Sigmund, 2001. Topology synthesis of large-displacement compliant mechanisms. Int. J. Num. Meth. Eng., 50: 2683-2705.

  • Ridzwan, M.I.Z., S. Shuib, A.Y. Hassan and A.A. Shokri, 2006. Effects of increasing load transferred in femur to the bone-implant interface. J. Applied Sci., 6: 183-189.
    CrossRef    Direct Link    

  • Sun, S.H., 2004. Optimum topology design for the stationary platen of a plastic injection machine. Comput. Ind., 55: 147-158.

  • Tang, H., Y. Jiang, X.Z. Luo, S.M. Ren and H.K. Genant, 2002. Assessment of periprosthetic bone loss after total hip arthroplasty. Chinese Med. J., 115: 510-513.

  • Thomas, H., M. Zhou and U. Schramm, 2002. Issues of commercial optimization software development. Struct. Multidisciplinary Optimizat., 23: 97-110.

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