Monitoring Fracture Site Properties With External Fixation

[+] Author and Article Information
G. S. Beaupre, W. C. Hayes, M. H. Jofe, A. A. White

Orthopaedic Biomechanics Laboratory, Charles A. Dana Research Institute, Beth Israel Hospital and Harvard Medical School, Boston, Mass. 02215

J Biomech Eng 105(2), 120-126 (May 01, 1983) (7 pages) doi:10.1115/1.3138395 History: Received June 11, 1982; Revised October 31, 1982; Online June 15, 2009


An in-vitro system has been devised to monitor the properties of an idealized fracture site immobilized with a Hoffman-Vidal external fixator. A dial gage was used to measure the relative pin displacements under controlled axial loading. The displacement measurements were then used in conjunction with a finite element model to predict the modulus of an idealized fracture site. Five fracture sites made of neoprene disks of different mechanical properties were monitored in order to simulate the increasing modulus of a healing fracture. Good agreement was observed between directly measured mechanical properties of the neoprene and those inferred from the combined finite element and pin displacement tests.

Copyright © 1983 by ASME
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