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The mean size of the vesselotomy was 4.8 mm, and the mean expansion rate of the donor vessel was 2.7 times. Conclusions Compared with the conventional end-to-side technique, the microscopic parachute end-to-side technique has three advantages easy vesselotomy, avoidance of anastomotic narrowing, and easy control of blood leakage from the anastomotic site. We believe that the microscopic parachute end-to-side technique might make free flaps easier and improve their clinical outcomes in severe extremity injuries.To date, the surgical delay of skin flaps is th