Stiffness analysis of tibia-implant system under cyclic loading |
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| Authors: | Elmar K. Tschegg Stefan Herndler Patrick Weninger Michael Jamek Stefanie Stanzl-Tschegg Heinz Redl |
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| Affiliation: | 1. Material Science Laboratory, Institute for Building Construction and Technology, University of Technology, Karlsplatz 13, A-1040 Vienna, Austria;2. Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, A-1200 Vienna, Austria;3. Institute of Physics and Materials Science, BOKU University of Natural Resources and Applied Life Sciences, A-1190 Vienna, Austria |
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| Abstract: | A testing method has been developed to characterize stiffness and permanent deformation of bone-implant systems. The system consists of an artificial tibia with simulated distal fracture stabilized by an unreamed intramedullary nail. This system was loaded with three different sequences at 2 Hz, each consisting of 40,000 sinusoidal cycles, simulating clinical relevant loading conditions. Evaluation of the results showed a stiffness of 2782 N/mm with a standard deviation of 311 N/mm and a permanent deformation of 0.64 mm with a standard deviation of 0.21 mm. The locking screws broke exclusively during the third loading sequence starting with the most proximal of the distal screws. The study provides a standard technique for biomechanical testing and a comparison of different bone/implant-systems avoiding the variability of cadaver bone tests. |
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