16.08.2022 | Original Article
Mechanical simulation study of reapproximated sternum rigidity comparing sternal fixation devices
Eiki Nagaoka, Hirokuni Arai
General Thoracic and Cardiovascular Surgery
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A reliable sternal fixation is one of the most basic parts of cardiac surgery requiring sternotomy for preventing wound complications and promoting early recovery. Although various products have been released to the markets, the characteristics of each device are still unclear.
A simulation study was conducted to compare the properties of two sternal fixation device: a commonly used monofilament stainless-steel wire and a newly designed cable comprised of several titanium alloys strands. Sternum models made of monomer casting nylon were tied with each material and displaced in longitudinal, antero-posterior, and horizontal directions. Resistance against each directional external force was measured and compared.
The titanium cable showed a higher resistance to every directional displacement since slight deviations and a twofold higher maximum strength than the stainless wire.
An in vitro simulation study revealed the titanium cable system provide stronger sternum fixation than stainless-steel wire