Application of Laser Engineered Net Shaping (LENS) to manufacture porous and functionally graded structures for load bearing implants

  • Amit Bandyopadhyay
  • B.  V. Krishna
  • Weichang Xue
  • Susmita Bose
Article

Abstract

Fabrication of net shape load bearing implants with complex anatomical shapes to meet desired mechanical and biological performance is still a challenge. In this article, an overview of our research activities is discussed focusing on application of Laser Engineered Net Shaping (LENS™) toward load bearing implants to increase in vivo life time. We have demonstrated that LENS™ can fabricate net shape, complex metallic implants with designed porosities up to 70 vol.% to reduce stress-shielding. The effective modulus of Ti, NiTi, and other alloys was tailored to suit the modulus of human cortical bone by introducing 12–42 vol.% porosity. In addition, laser processed porous NiTi alloy samples show a 2–4% recoverable strain, a potentially significant result for load bearing implants. To minimize the wear induced osteolysis, unitized structures with functionally graded Co–Cr–Mo coating on porous Ti6Al4V were also made using LENS™, which showed high hardness with excellent bone cell–materials interactions. Finally, LENS™ is also being used to fabricate porous, net shape implants with a functional gradation in porosity characteristics.

References

  1. 1.
    A. Sargeant, T. Goswami, Mater. Des. 27, 287 (2006)Google Scholar
  2. 2.
    B.V. Krishna, S. Bose, A. Bandyopadhyay, Acta Biomater. 3, 997 (2007)CrossRefPubMedGoogle Scholar
  3. 3.
    W. Xue, B.V. Krishna, S. Bose, A. Bandyopadhyay, Acta Biomater. 3, 1007 (2007)CrossRefPubMedGoogle Scholar
  4. 4.
    M. Assad, F. Likibi, P. Jarzem, M.A. Leroux, C. Coillard, CH.-H. Rivard, Mat.-wiss. u. Werkstofftech. 35, 219 (2004)CrossRefGoogle Scholar
  5. 5.
    S.A. Shabalovskaya, Biomed. Mater. Eng. 12, 69 (2002)PubMedGoogle Scholar
  6. 6.
    I.H. Oh, N. Nomura, N. Masahashi, S. Hanada, Scr. Mater. 49, 1197 (2003)CrossRefGoogle Scholar
  7. 7.
    R.M. Pillar, Int. J. Powder Metall. 34, 33 (1988)Google Scholar
  8. 8.
    C.E. Wen, M. Mabuchi, Y. Yamada, K. Shimojima, Y. Chino, T. Asahina, Scr. Mater. 45, 1147 (2001)CrossRefGoogle Scholar
  9. 9.
    K. Otsuka, C.M. Wayman, in Shape Memory Materials (Cambridge University Press, Cambridge 1998)Google Scholar
  10. 10.
    L. Korne, J. Mentz, M. Bram, H. Buchkremer, D. Stover, M. Wagner, G. Eggeler, D. Christ, S. Reese, D. Bogdanski, M. Koller, S.A. Esenwein, G. Muhr, O. Prymak, M. Epple, Adv. Eng. Mater. 7, 613 (2005)CrossRefGoogle Scholar
  11. 11.
    S. Wu, C.Y. Chung, X. Liu, P.K. Chu, J.P.Y. Ho, C.L. Chu, Y.L. Chan, K.W.K. Yeung, W.W. Lu, K.M.C. Cheung, K.D.K. Luk, Acta Mater. 55, 3437 (2007)CrossRefGoogle Scholar
  12. 12.
    H.G. Willert, H. Bertram, G.H. Buchhorn, Clin. Orthop. Relat. Res. 258, 95 (1990)PubMedGoogle Scholar
  13. 13.
    A.A. Edidin, C.M. Rimnac, V.M. Goldberg, S.M. Kurtz, Wear 250, 152 (2001)CrossRefGoogle Scholar
  14. 14.
    M. Jacobs, R. Gorab, D. Mattingly, L. Trick, C. Southworth, J. Arthroplasty 19(7), Suppl. 2, 48 (2004)Google Scholar
  15. 15.
    W. Pompe, H. Worch, M. Epple, W. Friess, M. Gelinsky, P. Greil, U. Hempel, D. Scharnweber, K. Schulte, Mater. Sci. Eng. A 362, 40 (2003)CrossRefGoogle Scholar
  16. 16.
    R.J. Narayan, L.W. Hobbs, C. Jin, A. Rabiei, JOM 58(7), 56 (2006)CrossRefGoogle Scholar
  17. 17.
    B.V. Krishna, S. Bose, A. Bandyopadhyay, Metall. Mater. Trans. A 38A, 1096 (2007)CrossRefADSGoogle Scholar
  18. 18.
    C. Greiner, S.M. Oppenheimer, D.C. Dunand, Acta Biomater. 1, 705 (2005)CrossRefPubMedGoogle Scholar
  19. 19.
    B.V. Krishna, W. Xue, S. Bose, A. Bandyopadhyay, Acta Biomater. 3, 697 (2008)CrossRefGoogle Scholar
  20. 20.
    A. Chiba, K. Kumagai, N. Nomura, S. Miyakawa, Acta Mater. 55, 1309 (2007)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Amit Bandyopadhyay
    • 1
  • B.  V. Krishna
    • 1
  • Weichang Xue
    • 1
  • Susmita Bose
    • 1
  1. 1.W. M. Keck Biomedical Materials Research Lab, School of Mechanical and Materials EngineeringWashington State UniversityPullmanUSA

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