A PHYSIOLOGICALLY ACCURATE MECHANICAL REPRESENTATION OF THE BONE-IMPLANT CONSTRUCT UNDER GAIT LOADS

Year 2012, Volume: 16 Issue: 3, 136 - 143, 01.06.2012

Rıza Bayoğlu A. Fethi Okyar

Abstract

-

Keywords

Biomedical implant, intramedullary nail, design performance, contact model, finite element method

YÜRÜME YÜKLERİ ALTINDA KEMİK İMPLANT YAPISININ DOĞRU MEKANİK TEMSİLİ

Abstract

Intramedullary nailing is a widely accepted technique utilized in the treatment of femoral fractures. Design of such devices should be accomplished based on physiological constraints, and loading of the femur, simulating in vivo conditions to prevent bone refracture and implant failure after surgical operation. It has been shown in literature that, walking is the most frequent dynamic activity of a patient, which necessitates testing implants mainly under walking loading conditions. In the present study, the response of the implanted femur having femoral mid-fracture as well as the intact femur were investigated at the instance of maximum hip contact force of the gait cycle in a finite element environment. Displacement and strain distribution on both bone- implant construct and intact bone were presented. The results may lead to an accurate estimation of the implants mechanical behavior in design stage, and be used in fatigue based analyses.

Keywords

Biyomedikal implant, intramedüler çivi, tasarım performans, kontak model, sonlu elemanlar yöntemi

References

• M. Morlock, E.Schneider, A.Bluhm, M.Vollmer, G.Bergmann, V.Mller, M.Honl, Duration and frequency of every day activities in total hip patients, Journal of biomechanics 34 (2001) 873–881.
• G.Bergmann, G.Deuretzbacher, M.Heller, F.Graichen, A.Rohlmann, J.Strauss, G.N.Duda, Hip contact forces and gait patterns from routine activities, Journal of biomechanics 34 (2001) 859–871.
• A. D.Speirs, M. O.Heller, G. N.Duda, W. R.Taylor, Physiologically based boundary conditions in finite element modelling, Journal of biomechanics 40 (2006) 2318–2323.
• J. Simoes, M. Vaz, S. Blatcher, M. Taylor, Influence of head constraint and muscle forces on the strain distribution within the intact femur, Medical Engineering and Physics 22 (2000) 453 – 459.
• G. Cheung, P. Zalzal, M. Bhandari, J. Spelt, M. Papini, Finite element analysis of a femoral retrograde intramedullary nail subject to gait loading, Medical Engineering and Physics 26 (2) (2004) 93 – 108.
• V.A.Papathanasopoulou, Intact and implanted femur behavior during walking and jogging, 2001 Proceedings of the 23rd Annual EMBS International Conference, October 25-28, Istanbul, Turkey.
• D. W.Wagner, K. Divringi, C. Özcan, M. Grujicic, B. Pandurangan, A. Grujicic, Combined musculoskeletal dynamics/structural finite element analysis of femur physiological loads during walking, Multidiscipline Modeling in Materials and Structures 6 417–437.
• R. Montanini, V. Filardi, In vitro biomechanical evaluation of antegrade femoral nailing at early and late postoperative stages, Medical engineering & physics 32 (2010) 889–897.
• M. Viceconti, M. Casali, B. Massari, L. Cristofolini, S. B. A. Toni, The â˜standardized femur programâ™ proposal for a reference geometry to be used for the creation of finite element models of the femur, Journal of biomechanics 29 (1996) 1241.
• ADINA R&D, Inc. Academic Research, Release 8.7.5.
• A. Okyar, R. Bayoglu, The effect of loading in mechanical response predictions of bone lengthening, Medical engineering & physics 34 (2012) 1362-1367.
• M. Taylor, K. Tanner, M. Freeman, A. Yettram, Stress and strain distribution within the intact femur: compression or bending? , Medical engineering & physics 18 (1996) 122–131.
• M. Heller, G. Bergmann, J.-P. Kassi, L. Claes, N. Haas, G. Duda, Determination of muscle loading at the hip joint for use in pre-clinical testing, Journal of biomechanics 38 (2005) 1155–1163.
• G. N. Duda, M. Heller, J. Albinger, O. Schulz, E. Schneider, L. Claes, Influence of muscle forces on femoral strain distribution, Journal of biomechanics 31 (1998) 841–846.
• M. Heller, G. Bergmann, G. Deuretzbacher, L. Drselen, M. Pohl, L. Claes, N. Haas, G. Duda, Musculo-skeletal loading conditions at the hip during walking and stair climbing, Journal of Biomechanics 34 (2001) 883–893.