Srpski arhiv za celokupno lekarstvo 2012 Volume 140, Issue 5-6, Pages: 332-338
https://doi.org/10.2298/SARH1206332G
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Results of application of external fixation with different types of fixators
Grubor Predrag (Ortopedsko-traumatološka klinika, Banja Luka, Bosna i Hercegovina)
Grubor Milan (Medicinski fakultet, Banja Luka, Bosna i Hercegovina)
Introduction. Extra-focal or external fixation is the method of fracture
fixation through the healthy part of the bone using pins or wires. Objective.
The aim was to determine which external splints (Ortofix, Mitković, Charnley
and Ilizarov) had the best biomechanical properties in primary stabilization
of spiral, transverse and commutative bone fractures. Methods. To determine
the investigation methodology of biomechanical characteristics of the
external fixator we used mathematical and computer simulator (software),
juvidur physical model and clinical examination. Results. Values of advancing
fragments in millimetres obtained by the study of mathematical and computer
simulator (software): Charnley - 0.080 mm, Mitković M 20 - 0.785 mm, Ilizarov
- 2.245 mm and Ortofix - 1.400 mm. In testing the juvidur model the following
values were obtained: the external fixator Mitković M20 - 1.380 mm, Ortofix -
1.470 mm, Ilizarov - 2.410 mm, and Charnley - 2.510 mm. Clinical research of
biomechanical characteristics of the effect of vertical force yielded the
following results: Mitković M20 - 0.89 mm, Ortofix - 0.14 mm, Charnley - 0.80
mm and Ilizarov - 1.23 mm. Conclusion. When determining the total number of
the stability test splints under the effect of vertical force (compression)
and force effect in antero-posterior, later-lateral plane of cross, spiral
and comminuted long bone fractures, the best unified biomechanical stability
was shown by the following external fixators: firstly, Mitković M20 (0.93mm),
secondly, Charnley fixator (1.14 mm), thirdly, Ortofix (1.22 mm), and
fourthly, Ilizarov (1.60 mm).
Keywords: external fixator, biomechanics, range of stability