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RESEARCH PAPERS

Stiffness Characteristics of the Circular Ilizarov Device as Opposed to Conventional External Fixators

[+] Author and Article Information
B. Gasser, B. Boman, D. Wyder, E. Schneider

M. E. Mueller-Institute for Biomechanics, University of Bern, Bern, Switzerland

J Biomech Eng 112(1), 15-21 (Feb 01, 1990) (7 pages) doi:10.1115/1.2891120 History: Received April 10, 1988; Revised August 03, 1989; Online March 17, 2008

Abstract

Ilizarov proposes the use of a special circular fixation device for treatment of bone defects and nonunions or for limb lengthening. Supposition was that the success of this method has to do with the specific mechanical behavior of the device. This behavior is a result of the configuration of the fixation elements. Therefore, a mechanical study of the sensitivity of the circular compression and distraction device (CDD) to configuration parameters was performed. The CDD was found to exhibit a nonlinear stiffness behavior, in particular under axial load. This may be favorable for the induction and tolerance of bone formation. Among the different parameters tested the ring radius was the most important with respect to stiffness. In general, the stiffness of the CDD allows adjustment during postoperative management. In magnitude, it is equal or lower when compared to other fixator types.

Copyright © 1990 by The American Society of Mechanical Engineers
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