Abstract
Understanding the evolution of callus mechanical properties over time provides insights in the mechanobiology of fracture healing and tissue differentiation, can be used to validate numerical models, and informs clinical practice. Bone transport experiments were performed in sheep, in which a distractor type Ilizarov was implanted. The forces through the fixator evolution were measured and the callus stiffness was estimated from these forces. Computerized tomography images were taken and bone volume of the callus at different stages was obtained. The results showed that the maximum bone tissue production rate (0.146 cm3/day) was achieved 20 days after the end of the distraction phase. 50 days after the end of the distraction phase, the callus was ossified completely and had its maximum volume, 6–10 cm3. In addition, 80–90% of the load sustained by the operated limb was recovered and the callus stiffness increased exponentially until 5.4–11.4 kN/mm, still below 10% of the healthy level of callus stiffness. The effects of the bony bridging of the callus and the time of the fixator removal on callus force, stiffness and volume were analyzed. These outcomes allowed relating quantifiable biological aspects (callus volume and tissue production rate) with mechanical parameters (callus force and stiffness) using data from the same experiment.
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Acknowledgments
The authors gratefully acknowledge the research support of the Consejería de Innovacion, Ciencia y Empleo de la Junta de Andalucía (P09-TEP-5195) and the FPU grant of the Ministerio de Educación del Gobierno de España (AP2010-5061). The authors are also grateful to the University of Zaragoza for its collaboration.
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The authors have no financial or personal relationships that could inappropriately influence the contents of this paper.
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Mora-Macías, J., Reina-Romo, E., López-Pliego, M. et al. In Vivo Mechanical Characterization of the Distraction Callus During Bone Consolidation. Ann Biomed Eng 43, 2663–2674 (2015). https://doi.org/10.1007/s10439-015-1330-7
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DOI: https://doi.org/10.1007/s10439-015-1330-7