Biomechanical Testing of Spinal Segment Fixed by Arcofix System on the Swine Spine
2015
Study Design: An in vitro biomechanical study. Purpose: To
evaluate the mechanical properties of the spinal segment in the
intact, injured, and stabilized state after fixation by an
Arcofix implant. Overview of Literature: Several types of
thoracolumbar spine injury necessitates anterior
instrumentation. The Arcofix plate represents the latest
generation of angular stablity systems. The biomechanical
properties of these implants have not been sufficiently studied
yet. Methods: A total of ten porcine specimens (levels Th12-L3)
were prepared. The tests were performed for intact, injured,
and implanted specimens. In each state, the specimen was
subjected to a tension load of a prescribed force, and
subsequently, twisted by a given angle. The force load was 200
N. The torsion load had a deformation character, i.e., the
control variable was the twisting angle and the measured
variable was the moment of a couple. The amplitude of the load
alternating cycle was 3°. Another parameter that was evaluated
was the area of the hysteresis loop. The area corresponds to
the deformation energy which is dissipated during the cycle.
Results: A statistically significant difference was found
between the intact and injured states as well as between the
injured and implanted specimens. The statistical evaluation
also showed a statistically different value of the hysteresis
loop area. In the case of instability, the area decreased to
33% of the physiological value. For the implanted sample, the
area increased to 170% of the physiological value. Conclusions:
The Arcofix implant with its parameters appears to be suitable
and sufficiently stable for the treatment of the anterior
column of the spine.
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