Augmented Reality and 3D Printing as an Aid to Surgical Planning in Modern Microtia Reconstruction.

Since Tanzer's seminal work introducing costal cartilage for ear reconstruction, subsequent advances by Brent, Nagata, and Firmin have refined surgical techniques and aesthetic outcomes. However, fundamental aspects of the procedure-such as planning incisions, achieving accurate ear positioning, and guiding chest wall incisions for rib harvest-have seen limited innovation. The current standard practice of using projection paper or transparent templates to replicate the contralateral ear position remains imprecise. Similarly, autologous cartilage harvest can be particularly challenging in patients with higher BMI, due to difficulty in accurate rib palpation and visualization. Misplaced chest wall incisions can result in suboptimal rib harvest, longer operative times, and increased morbidity. In this study, we introduce patient-specific, three-dimensional (3D) printed masks, termed hEARo masks, as a novel and user-friendly tool for ear framework positioning. Furthermore, we present the integration of augmented reality (AR) technology to enhance preoperative planning and intraoperative guidance during microtia repair, enabling more precise incision placement for rib harvest. The combined use of 3D printing and AR facilitates complex ear reconstruction, offering increased surgical precision, reduced operative time, and potentially improved patient outcomes. These innovations represent a significant advancement in the personalization and accuracy of auricular reconstruction.