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Background Resorption of the cartilage framework results from hematoma or infection, deteriorating outcomes in microtia reconstruction. Delayed resorption still occurs for unclear reasons in patients without adverse events. The risk factors for delayed framework resorption were explored in this 20-year microtia cohort. Methods Patients who underwent auricular elevation 5 years ago were reviewed from January 2001 to March 2019. Bilateral microtia, infection, and hematoma cases were excluded. Framework resorption was graded on the last