An Overview of the Currently Used Congenital Auricular Anomalies (CAA) Classifications for Surgical Reconstruction: A Scoping Review

Background: CAAs are congenital malformations of the auricle ranging from ear underdevelopment to anotia, lacks standardized classification, impacting our outcome of different reconstruction approaches. This scoping review aimed to explore which CAA classifications are most used in current ear reconstruction practices. Methods: We conducted a scoping review following the PRISMA guidelines, searching MEDLINE and Embase databases on November 1st, 2023. Studies on CAA reconstruction that included clear descriptions of the used classification published in the past 5 years were included. Studies were appraised using the Joanna Briggs Institute checklist. Results: Out of 293 screened studies, 45 met inclusion criteria, encompassing 19 case series and 5 cohort studies. Findings revealed a predominant use of the Nagata classification across rib cartilage and alloplastic material reconstructions, despite noted application inconsistencies. Other systems like Marx's, Weerda's, and Meurman's remain underutilized. Conclusion: Most studies used the Nagata's classification. Its widespread use underscores the necessity for an easy to use, but standardized classification to improve surgical outcome reporting and assessment accuracy. Further investigation and standardization efforts regarding the Nagata system are recommended.