Engineering Transactions, 64, 4, pp. 621–627, 2016

An Experimentally Validated Model for the Ilizarov Fixator Considering the Loss of Wire’s Pretension

Stavros K. KOURKOULIS
National Technical University of Athens
Greece

Athanasios MITOUSOUDIS
National Technical University of Athens
Greece

The purpose of this study is to assess the biomechanical performance of the Ilizarov fixator and to attempt optimization of its configuration. Attention is focused to the quantification of the wires’ pretension loss. The study is implemented according to a combined experimental and numerical scheme: The data of a long series of experiments are used to calibrate and validate a numerical model. The model is then used for parametric analysis of the factors which, according to clinical experience, influence the efficiency of the device. It was concluded that the most critical factors are the pretension of the wires, the angle between them and the rings’ diameter; the role of the remaining factors is of rather minor importance.
Keywords: Ilizarov fixator; pretension loss; axial loading; torsional loading; finite element method
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References

Fleming B., Paley D., Kristiansen T., Pope M., A biomechanical analysis of the Ilizarov external fixator, Clinical Orthopaedics and Related Research, 241: 95–105, 1989.

Mitousoudis A.S., A study of the Ilizarov external osteosynthesis in the direction of documenting optimum assemblies for various clinical scenarios (URI:

http://dspace.lib.ntua.gr/handle/123456789/3761), PhD Thesis, National Technical University of Athens, Department of Mechanics, Supervisor: S.K. Kourkoulis, 2011.

Ryan S., Ehrhart N., Zuehlsdorff K., James S., Comparison of alternate and simultaneous tensioning of wires in a single-ring fixator construct, Veterinary Surgery, 38(1): 96–103, 2009, doi: 10.1111/j.1532-950X.2008.00469.x.

Kourkoulis S.K., Mitousoudis A.S., A parametric study of the Ilizarov fixator with an experimentally validated model considering the loss of wire’s pretension, to be submitted, 2016.




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