Purpose It has been known through many studies that surgical repair within two weeks after injury can be expected to have better prognosis compared to repair latter than two weeks. However, few studies have been conducted on whether there is a difference in prognosis between adults and children patients who underwent surgery within two weeks. There are differences such as fracture patterns between adults and pediatric patients, therefore age can be a clinically significant factor in expecting post-operative results. This study tried to confirm statistical significance of correlation between post-operative prognosis and the severity of fracture according to the age.Methods This study was performed by reviewing patient’s medical records and initial pre-operative computed tomography(CT) images from 2009 to 2020. The patients who underwent surgical repair latter than two weeks were excluded. Pediaric patient was defined as age 0-19 years (group 1), and adult patient was defined as age over 19 years (group 2). Age, passed duration before surgery, fracture dimension, and postoperative score were investigated. Postoperative scores were divided into 4 scales depending on the complications such as enophthalmos and remained diplopia after surgery. And fracture dimension was evaluated by measuring the maximum diameter of anteroposterior and transverse section of computed tomography image.Results Among 65 unilateral patients two weeks after injury performed by one faculty (n=65), 10 were pediatric patients and 55 were adult patients. There was no statistically significant difference(p=0.74) in post-operative score between adult and pediatric patients who had surgical repair within two weeks. Passed duration before surgery was shorter in pediatric patients than in adult's, and it has statistically significant difference(p=0.03). There was negative correlation(p0.05).Conclusion In pediatric patients, there is no statistically significant correlation between post-operative result and defect dimension, therefore another factors may be more helpful in predicting the post-operative result than the defect dimension identified in CT scan.