Creation of a validated 3D finite element model of an ovine tibia

Grant, Caroline A., Schmutz, Beat, Steck, Roland, Schuetz, Michael, & Epari, Devakara R. (2010) Creation of a validated 3D finite element model of an ovine tibia. In International Society for Fracture Repair, 12th Biennial Conference, 25-29 September, 2010, London. (Unpublished)

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Introduction Ovine models are widely used in orthopaedic research. To better understand the impact of orthopaedic procedures computer simulations are necessary. 3D finite element (FE) models of bones allow implant designs to be investigated mechanically, thereby reducing mechanical testing.

Hypothesis We present the development and validation of an ovine tibia FE model for use in the analysis of tibia fracture fixation plates.

Material & Methods Mechanical testing of the tibia consisted of an offset 3-pt bend test with three repetitions of loading to 350N and return to 50N. Tri-axial stacked strain gauges were applied to the anterior and posterior surfaces of the bone and two rigid bodies – consisting of eight infrared active markers, were attached to the ends of the tibia. Positional measurements were taken with a FARO arm 3D digitiser.

The FE model was constructed with both geometry and material properties derived from CT images of the bone. The elasticity-density relationship used for material property determination was validated separately using mechanical testing. This model was then transformed to the same coordinate system as the in vitro mechanical test and loads applied.

Results Comparison between the mechanical testing and the FE model showed good correlation in surface strains (difference: anterior 2.3%, posterior 3.2%).

Discussion & Conclusion This method of model creation provides a simple method for generating subject specific FE models from CT scans. The use of the CT data set for both the geometry and the material properties ensures a more accurate representation of the specific bone. This is reflected in the similarity of the surface strain results.

Impact and interest:

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ID Code: 34149
Item Type: Conference Item (Poster)
Refereed: No
Keywords: Finite Element Analysis, Mechanical Testing, Ovine Tibia
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Medical Devices (090304)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2010 the authors.
Deposited On: 17 Aug 2010 06:40
Last Modified: 17 Aug 2010 06:40

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