Preliminary Mechanical Evaluation of Two Novel Veterinary Angle-Stable-Threaded Interlocking Nail Systems

Introduction: The interlocking nail system represents an excellent option for fixing long bones fractures in veterinary medicine. Good outcome has been reported over the years, however, several failures has been seen as well. From a mechanical point of view, previous generations present slack that can potentially lead to delay in bone healing. Additionally, there are limitations concerning specific types of fractures, such as metaphyseal and epiphyseal fractures.

Materials and Methods: The present study mechanically tested and compared axial compression loads of two novel models of angle-stable interlocking nails with threaded holes. The specimens were divided into three groups: conventional interlocking nail (G1), novel interlocking nail with a stable angle with holes arranged in a single plane (G2), and novel interlocking nail with a stable angle in two planes, with the penultimate hole at 90 degrees from the others (G3).

Results: All the specimens showed plastic deformation in the screws after destructive tests, in both proximal and distal sides, being highly intense in G1. G2 and G3 of the stable angle rods supported higher loads than G1 in all tests performed. The novel nails did not differ statistically from each other.

Discussion/Conclusion: The initial hypothesis that the novel models would provide increased stability was confirmed. The screw locking system on the nail allowed high resistance values in the tests performed, proving to be effective and potentially applicable in real clinical situations.

Acknowledgement: This study was funded by FAPESP (2018/22293–3) and financed in part by the CAPES, Brasil.

 

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Artikel online veröffentlicht:
26. Oktober 2022