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Risk assessment in delayed free flap reconstruction for severe lower extremity trauma

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European Journal of Orthopaedic Surgery & Traumatology Aims and scope Submit manuscript

Abstract

Purpose

This study aims to identify serum biomarkers that contribute to vascular thrombosis and complete flap failure in delayed reconstruction with free flaps, as well as to develop a scoring system of risk assessment including these biomarkers.

Methods

A retrospective review of the database was conducted for lower extremity open fractures reconstructed between 7 and 90 days from injury, from March 2014 to February 2022. We investigated changes in platelet count (PLT), D-dimer, creatine phosphokinase (CPK), and C-reactive protein (CRP) and then, developed a risk assessment system including these biomarkers as risk factors.

Results

A total of 62 free flaps were enrolled, and vascular thrombosis occurred in 14 flaps (22.6%), 9 of which (14.5%) developed complete flap failure. The risk assessment score was set to a maximum of 6 points for 6 items: age ≤ 40 years, time from injury to coverage ≥ 14 days, zone of injury from middle to distal leg, D-dimer on the day of injury ≥ 60 µg/mL, maximum value of CPK ≥ 10,000 U/L, and maximum value of CRP ≥ 25 mg/dL. The best cutoff score was 3 in the vascular thrombosis model (sensitivity: 0.79, specificity: 0.77) and 4 in the complete flap failure model (sensitivity: 0.78, specificity: 0.92).

Conclusions

Our risk assessment system showed that the risk of vascular thrombosis was high at ≥ 3 points and that of complete flap failure was high at ≥ 4 points. Significantly, elevated levels of D-dimer, CPK, and CRP require more caution during reconstruction using free flaps.

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Acknowledgements

We would like to thank Enago (www.enago.jp) for English language editing.

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No funds, grants, or other support were received for this study.

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Correspondence to Keisuke Shimbo.

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Shimbo, K., Shinomiya, R., Sunagawa, T. et al. Risk assessment in delayed free flap reconstruction for severe lower extremity trauma. Eur J Orthop Surg Traumatol 33, 2515–2523 (2023). https://doi.org/10.1007/s00590-022-03467-w

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  • DOI: https://doi.org/10.1007/s00590-022-03467-w

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