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目的:评估金属手术定位片辅助半面短小畸形患者下颌骨截骨的可行性和精确性。方法:选择2018年5至11月间上海交通大学医学院附属第九人民医院整复外科就诊的PruzanskyⅡ型半面短小畸形患儿为研究对象。术前拍摄CT，通过Mimics 19.0设计截骨方案，制备金属手术定位片。术中在手术定位片的引导下，行半面短小畸形的截骨、牵引器置入术。待牵引达到术前设计的长度后结束牵引，拍摄CT。利用逆向工程软件Geomagic Control对术前和牵引完成后的2组下颌骨数据进行配准，随机选取截骨面上的6个点获得误差值，取其平均值记作截骨面之间的距离误差，同时计算截骨面之间的夹角，记作角度误差。距离误差采用2 mm作为参考值，角度误差采用5°作为参考值，在SPSS 25.0中进行单样本n t检验，以n P0.05)。n 结论:金属手术定位片辅助半面短小畸形下颌骨截骨具有可行性，精确性较高，有利于术前设计方案在术中实现，术后可获得良好的效果。“,”Objective:To evaluate the feasibility and accuracy of surgical template guides to assist mandibular osteotomies in craniofacial microsomia.Methods:Ten children diagnosed with craniofacial microsomia (Pruzansky Ⅱ) from May 2018 to November 2018, at the Department of Plastic and Reconstructive Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, were selected for this study. First, pre-operative CT scans were prescribed, osteotomy plans were designed by Mimics 19.0, and individualized template guides were manufactured before surgery. Under the guidance of the surgical template, distraction osteotomy of craniofacial microsomia and distractor implantation surgeries were performed until the proposed length was reached. Then, another CT scan was performed. Based on the registration of pre- and post-surgery mandible statistics harvested by Geomagic Control, six points were randomly chosen on the osteotomy surface to estimate deviations, the mean value of which was calculated as distance deviation between the osteotomy surfaces. Meanwhile, the angle between the osteotomy surfaces was considered as angular deviation. Considering the deviation of 2 mm in distance and 5 degrees in angles as references, a single-sample n t-test was conducted in SPSS 25.0 and it was considered as statistically significant when n P0.05).n Conclusions:Metal surgical template guides are applicable to assist mandibular osteotomies of craniofacial microsomia with relatively high accuracy, which is beneficial to the intraoperative application of preoperative design so that satisfying effects could be achieved after surgeries.