Abstract
Purpose
To assess the technical feasibility of contrast-enhanced ultrasound (CEUS) in the monitoring of non-infected long bone nonunion healing.
Methods
Twenty-five patients (16 males; mean age: 40.4 ± 11.7) with long bone nonunion were treated using surgery and mesenchymal stem cells and platelet-rich plasma. They performed CEUS up to 15 days before, 7 days, 4 and 8 weeks after treatment. To categorize the angiogenesis around the fracture site, the microvascular blood flow from CEUS was classified into four categories, depending on the portion of the investigated area that was involved in the neovascularization process: grade 0 = 0%; grade 1 = 0–30%; grade 2 = 30–70%; grade 3 = 70–100%. Nonparametric Friedman and Wilcoxon statistics were used.
Results
Before treatment, neovascularization was graded as 0 in 15/25 patients, as 1 in 10/25. Vascularity significantly increased over time (P < 0.001), namely: 1 (25th–75th percentile = 1–2) at 7 days; 2 (1–2) at 4 weeks; 3 (0–2) at 8 weeks. All patients but one showed early progressive increase in neovascularization well identified with CEUS at the fracture site.
Conclusion
CEUS is a feasible method to monitor healing in patients with long bone nonunion.
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Acknowledgements
At the moment the work was conducted, Domenico Aloj was affiliated with the Department of Orthopedics and Traumatology, I Clinic, Azienda Ospedaliera Universitaria Città della Salute e della Scienza, CTO Hospital, Via Zuretti 29, 10126 Turin, Italy.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors. Institutional review board approval for retrospective publication of data was obtained, and patients’ informed consent was waived.
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Pozza, S., De Marchi, A., Albertin, C. et al. Technical and clinical feasibility of contrast-enhanced ultrasound evaluation of long bone non-infected nonunion healing. Radiol med 123, 703–709 (2018). https://doi.org/10.1007/s11547-018-0902-7
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DOI: https://doi.org/10.1007/s11547-018-0902-7