Hopkins, Justin; Nguyen, Kevin; Heyrani, Nasser; Shelton, Trevor; Kreulen, Christopher; Garcia-Nolen, Tanya; Christiansen, Blaine A; Giza, Eric

doi:10.1016/j.jor.2019.06.020

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InternalBrace has biomechanical properties comparable to suture button but less rigid than screw in ligamentous lisfranc model

2020

Published Web Location

https://doi.org/10.1016/j.jor.2019.06.020

Abstract

Purpose

The aim of this study was to investigate the biomechanical properties of the InternalBrace for lisfranc injuries.

Methods

A Sawbone model was developed comparing screw, suture button and InternalBrace.

Results

When loaded in axial tension at 0.5 mm/s, the screw was stiffest (2,240 N/mm), while the InternalBrace (200 N/mm) was stiffer than the suture button (133 N/mm). Cyclic loading with 10,000 cycles of 69 N, 138 N, and 207 N showed the InternalBrace maintained stiffness, but fatigued earlier than the suture button.

Conclusion

The mechanical properties of the InternalBrace support clinical use, but further studies are needed regarding early weight bearing.

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