Objective To explore the clinical efficacy of an expansion flap assisted brace in tissue expansion surgery. Methods A retrospective analysis was conducted on 88 patients with lumbar soft tissue expanders implanted from January 2022 to March 2024. Patients were divided into an experimental group （n=45） and a control group （n=43）. The experimental group received a customized assisted brace during the expansion phase， while the control group did not use the brace. Expansion efficiency indices and complication rates were compared between the two groups. Results The expansion efficiency index in the experimental group （0.92±0.06） was significantly higher than that in the control group （0.78±0.11，P<0.001）， indicating an 18% improvement in expansion efficiency. The complication rate in the experimental group （4.44%） was significantly lower than that in the control group （20.93%，P=0.012）. The use of auxiliary braces reduced the risk of complications by 79% （OR=0.21，95% CI 0.08-0.55）. Conclusion The expansion flap assisted brace can significantly improve soft tissue expansion efficiency and reduce complication risks， demonstrating substantial clinical value.

Expansion flap assisted brace, Tissue expansion surgery, Surgical nursing, Expansion efficiency,