Inverted Horseshoe Osteotomy for Vertical Chin Reduction and Masculinization Procedure With Individual Mandibular Angles Implants.

Sliding genioplasty is an established surgical technique used in orthognathic and facial plastic surgery. It enables the correction of multiple bone discrepancies, such as pro- or retrogenia, as well as asymmetries. Chin narrowing procedures are beneficial in gender-affirming surgery for male-to-female patients, as they provide a more triangular shape to the lower face, which is considered more feminine. However, <10% of transgender patients undergo female-to-male transition where the lower face needs to be more squared, with prominent angles and a strong chin. Moreover, cisgender males are increasingly opting for facial aesthetic surgery to enhance their masculine appearance. This study presents the protocol for lower face masculinization with a modified chin osteotomy that may be used in conjunction with custom mandibular angle implants.