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1: J
Biomech. 1992 Sep;25(9):995-1006.

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Biomechanical consequences of
callus development in Hoffmann, Wagner, Orthofix and Ilizarov external
fixators.

Juan JA, Prat J, Vera P, Hoyos JV,
Sanchez-Lacuesta J, Peris JL, Dejoz R, Alepuz R.

Instituto de
Biomecanica de Valencia, Valencia Parc Tecnologic, Spain.

A
theoretical analysis by a finite elements model (FEM) of some external
fixators (Hoffmann, Wagner, Orthofix and Ilizarov) was carried out. This
study considered a logarithmic progress of callus elastic
characteristics. A standard configuration of each fixator was defined
where design and application characteristics were modified. A comparison
among standard configurations and influence of every variation was made
with regard to displacement and load transmission at the fracture site.
An experimental evaluation of standard configurations was performed with
a testing machine. After experimental validation of the theoretical
model was achieved, an application of physiological loads which act on a
fractured limb during normal gait was analysed. A minimal contribution
from an external fixator to the total rigidity of the
bone-callus-fixator system was assessed when a callus showing minimum
elastic characteristics had just been established. Insufficient rigidity
from the fixation devices to assure an adequate immobilization during
the early stages of fracture healing was verified. However, regardless
of the external fixator, callus development was the overriding element
for the rigidity of the fixator-bone system.

PMID: 1517275
[PubMed - indexed for MEDLINE]

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