The subsurface fatigue that occurs in the Ultra-High Molecular Weight Polyethylene (UHMWPE) hip joint cup has been identified to be correlated with the contact stress at that cup. This cup stress is known to be affected by the implant design, dimensions and materials. In this study, a 3D finite element modeling has been used to investigate the effects on the cup contact stress when using low stiffness Titanium alloy (Ti) as a femur head. Also, the effects on the cup contact stress due to using different sizes of femur heads, and the presence of metal backing shell with different thicknesses are studied. The finite element results show that the use of low stiffness Ti alloy femur head results in a significant decrease in the cup contact stress compared with Stainless Steel (SS) and Cobalt Chromium (Co Cr Mo) femur heads. The presence of metal backing shell up to 1 mm thickness results in a remarkable decrease in the cup contact stresses especially for small femur heads. Finally, the use of larger femur heads, up to 32 mm diameter, results in significant decrease in the overall predicted hip joint contact. The present results indicate that any changes in design and geometrical parameters of the hip joint have significant consequences in the long term behaviour of the artificial hip joint and should be taken into consideration.
KeywordsFinite Element ModelingHip JointUHMWPEFemur Head Dimensions
Teoh, S.H., Chan, W.H. and Thampuran, R. (2002) An elasto-plastic finite element model for polyethylene wear in total hip arthroplasty. Journal of Biomechanics, 35, 323-330. doi:10.1016/S0021-9290(01)00215-9
Saikko, V. and Shen, M. (2010) Wear comparison between a dual mobility total hip prosthesis and a typical modular design using a hip joint simulator. Wear, 268, 617-621. doi:10.1016/j.wear.2009.10.011
Unsworth, A., Scholes, S.C., Smith, S.L., Elfick, A.P.D. and Ash, H.A. (2000) Tribology of replacement hip joints. Tribology and Interface Engineering Series, 38, 195-202.
Wilches, L.V., Uribe, J.A. and Toro, A. (2008) Wear of materials used for artificial joints in total hip replacements. Wear, 265, 143-149. doi:10.1016/j.wear.2007.09.010
Ilchmann, T., Reimold, M. and Müller-Schauenburg, W. (2008) Estimation of the wear volume after total hip replacement: A simple access to geometrical concepts. Medical Engineering & Physics, 30, 373-379. doi:10.1016/j.medengphy.2007.04.003
Barnes, C.L., De Boer, D., Corpe, R.S., et al. (2008) Wear performance of large-diameter differential-hardness hip bearings. The Journal of Arthroplasty, 23, 56-60. doi:10.1016/j.arth.2008.05.021
Affatato, S., Bersaglia, G., Rocchi, M., Taddei, P., Fagnano, C. and Toni, A. (2005) Wear behaviour of crosslinked polyethylene assessed in vitro under severe conditions. Biomaterials, 26, 3259-3267. doi:10.1016/j.biomaterials.2004.07.070
Wang, Q.L., Liu J.L. and Ge, S.R. (2009) Study on biotribological behavior of the combined joint of CoCrMo and UHMWPE/BHA composite in a hip joint simulator. Journal of Bionic Engineering, 6, 378-386.
Furmanski, J., Anderson, M., Bal, S., Greenwald, A.S., Halley, D., Penenberg, B., Ries, M. and Pruitt, L. (2009) Clinical fracture of cross-linked UHMWPE acetabular liners. Biomaterials, 30, 5572-5582. doi:10.1016/j.biomaterials.2009.07.013
Fouad, H. (2010) Experimental and numerical studies of the notch strengthening behaviour of semi-crystalline ultra-high molecular weight polyethylene. Materials & Design, 31, 1117-1129. doi:10.1016/j.matdes.2009.09.042
Mourad, A.-H.I., Fouad, H., and Rabeh, E. (2009) Impact of some environmental conditions on the tensile, creeprecovery, relaxation, melting and crystallinity behaviour of UHMWPE-GUR 410-medical grade. Materials & Design, 30, 4112-4119. doi:10.1016/j.matdes.2009.05.001
Fouad, H., Mourad, A.-H.I. and Barton, D.C. (2005) Effect of pre-heat treatment on the static and dynamic thermo-mechanical properties of ultra-high molecular weight polyethylene. Polymer Testing, 24, 549-556. doi:10.1016/j.polymertesting.2005.02.007
Mohamed, H.F., Mourad A-H.I. and Barton D.C. (2008) UV irradiation and aging effects on nanoscale mechanical properties of ultra high molecular weight polyethylene for biomedical implants. Plastics, Rubber and Composites, 37, 346-352. doi:10.1179/174328908X314370
Griza, S., Cê, A.N., Silva, E.P., Bertoni, F., Reguly, A. and Strohaecker, T.R. (2009) Acetabular metal backed fatigue due to severe wear before revision. Engineering Failure Analysis, 16, 2036-2042. doi:10.1016/j.engfailanal.2009.01.004
Ray, C.W., Joshua, J.J., Barrington, A. and Harry, E.R. (2005) The Acetabular insert-metal backing interface: An additional source of polyethylene wear debris. The Journal of Arthroplasty, 20, 914-922.
Frank, S.C., Paul, E.D.C., Ashay, A.K., Jen, F.L., Victor, H.F., Steven, A.S. and Joseph, D.Z. (1998) Results of cemented metal-backed acetabular components: A 10-year-average follow-up study. The Journal of Arthroplasty, 13, 67-873.
Burger, N.D.L., De Vaal, P.L., Meyer, J.P. (2007) Failure analysis on retrieved ultra high molecular weight polyethylene (UHMWPE) acetabular cups. Engineering Failure Analysis, 4, 1329-1345. doi:10.1016/j.engfailanal.2006.11.005
Korhonen, R.K., Koistinen, A., Konttinen, Y.T., Santavirta, S.S. and Lappalainen, R. (2005) The effect of geometry and abduction angle on the stresses in cemented UHMWPE acetabular cups-finite element simulations and experimental tests. BioMedical Engineering Online, 4, 32. doi:10.1186/1475-925X-4-32
Rixrath, E., Wendling-Mansuy, S., Flecher, X., Chabrand, P. and Argenson, J.N. (2008) Design parameters dependences on contact stress distribution in gait and jogging phases after total hip arthroplasty. Journal of Biomechanics, 41, 1137-1142. doi:10.1016/j.jbiomech.2007.12.009
Bertram, T., Anton, H., Johan, K., Veronika, K., Gunnar, F., Nico, V., Ron, D. (2008) Association between contact hip stress and RSA-measured wear rates in total hip arthroplasties of 31 patients. Journal of Biomechanics, 41, 100-105. doi:10.1016/j.jbiomech.2007.07.010
Barbour, P.S.M., Barton, D.C. and Fisher, J. (1995) Influence of contact stress on the wear of UHMWPE for total replacement hip prostheses. Wear, 181, 250-257.
Jiang, H.-B. (2007) Static and dynamic mechanics analysis on artificial hip joints with different interface designs by the finite element method. Journal of Bionic Engineering, 4, 123-131. doi:10.1016/S1672-6529(07)60024-9
Bennett, D. and Goswami, T. (2008) Finite element analysis of hip stem designs. Materials & Design, 29, 45-60. doi:10.1016/j.matdes.2006.12.014
Marianne S. D., Luc W., Siegfried D., Kai-Uwe S. (2008) Development of a new design of hip protectors using finite element analysis and mechanical tests. Medical Engineering & Physics, 30, 1186-1192. doi:10.1016/j.medengphy.2008.02.011
Kang, L., Galvin, A.L., Jin, Z.M. and Fisher, J. (2006) A simple fully integrated contact-coupled wear prediction for ultra-high molecular weight polyethylene hip implants: Journal of Engineering in Medicine, 220, 33-46. doi:10.1243/095441105X69033
Bowsher, J.G., Donaldson, T.K., Willians, P.A. and Clarke, I.C. (2008) Surface damage after multiple dislocations of a 38-mm-diameter, metal-on-metal hip prosthesis. The Journal of Arthroplasty, 23, 1090-1096. doi:10.1016/j.arth.2007.09.007
Elfick, A.P.D., Hall, R.M., Pinder, I.M. and Unsworth, A. (1998) Wear in retrieved acetabular components: Effect of femoral head radius and patient parameters. The Journal of Arthroplasty, 13, 291-295. doi:10.1016/S0883-5403(98)90174-7
Darwish, S.M. and Al-Samhan, A.M. (2009) Optimization of artificial hip joint parameters. Material Science and Engineering Technology, 40, 218-223.
ANSYS Version 12 (2009) ANSYS, Inc., Canonsburg.
Muratoglu, O.K., Bragdon, C.R., O’Connor, D., Perinchief, R.S., Estok, D.M., Jasty, M. and Harris, W.H. (2001) Larger diameter femoral heads used in conjunction with a highly cross-linked ultra high molecular weight polyethylene: A new concept. The Journal of Arthroplasty, 16, 24-30. doi:10.1054/arth.2001.28376
Tomokazu, H., Keizo, M., Shigeo, N., Keiji, S., Mitsuo, N. and Akihiro, S. (2002) Material rigidity of fracture fixation device and bone tissue reaction. Experimental study on intramedullary fixation with different materials. Proceedings of Annual Meeting of Japanese Society for Orthopaedic Biomechanics, 23, 299-304.