Effectiveness, Complications, and Stability: A Long-term Retrospective Study of Himi-lengthening Genioplasty.

The authors conducted a retrospective analysis of the patients who underwent himi-lengthening genioplasty (HLG) in our department since 2020, using digital technology for a comprehensive comparative analysis of bone stability, facial symmetry, and neurosensory evaluation, aiming to evaluate the effectiveness and potential risks of HLG and provide a reference for oral and maxillofacial surgeons. A total of 23 patients were included in our study. Among them, 13 patients underwent HLG, while 10 patients underwent conventional genioplasty. The follow-up period was 1 year postoperatively. The measurements the authors recorded included 2-point discrimination (TPD) test values of lip and chin, the mandibular similarity index, the volumes of chin segments, and the absorption rates. All these measurements were compared by statistical method. The TPD values increased 1 day and 4 days postoperatively and were statistically significant ( P <0.05), but when 1 month and 3 months postoperatively, the differences in TPD values were not statistically significant. The mandibular similarity index of the HLG group is better at 1 year after surgery ( P =0.005). The difference in the stability of the chin segments was not statistically significant between the 2 groups.