Journal
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
Volume 28, Issue 8, Pages 1203-1208Publisher
ELSEVIER
DOI: 10.1016/j.msec.2008.09.022
Keywords
Bone-implant-system; Polymer-composite bone; Distal tibia fracture; Fatigue loading; Stiffness; Permanent deformation
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Funding
- Austrian Workers' Compensation Board (AUVA)
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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. (C) 2008 Elsevier B.V. All rights reserved.
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