Abstract: Objective　To explore the clinical efficacy of pre-dilated flaps designed according to subunit principles in repairing facial scars. Methods　 A retrospective analysis was conducted on 8 patients with facial scars admitted from May 2018 to September 2020, including 5 males and 3 females, aged from 6 to 47 years old, with an average age of 21 years old, and scar size of 4 cm×7 cm-12 cm×9 cm. According to the design of facial subunit divisions, head or neck dilator implantation was performed in stage I, and water injection was performed for 2-3 months. After water injection, facial scar resection and dilated flap repair were performed in stage Ⅱ, and the donor flap area was directly closed and sutured. Results　All the 8 cases of dilated flaps survived and the wound healing was good. The color and texture of the dilated flaps were similar to those of the face, and the facial morphology and function were satisfactory after 6-12 months of follow-up. Morphological and functional scores were higher after repair, and the difference was statistically significant (P<0.05). Conclusion　Pre-dilated flaps designed according to the subunit principle are recommended for repairing facial scar, and the shape, contour and function can be improved.

Key words: Facial scar, 　Subunits, 　Dilated flap