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Nasal bone fracture is the most common facial fracture; however, surgery does not guarantee reduction and complications, such as undercorrection, overcorrection, and deviation, may occur. By analyzing findings of computed tomography (CT) immediately and at 3 months postoperatively, we evaluated the accuracy of reduction and long-term changes to the nasal bone.Patients with pure nasal bone fracture were evaluated from January 1, 2010 to December 31, 2011. First, we categorized fracture types according to the Stranc-Robertson classification system, using preoperative CT findings (ie, F1, F2, L1, and L2). We categorized each result of reduction by immediate postoperative CT scan findings as “Excellent,” “Good,” “Fair,” and “Poor,” with “Excellent” and “Good” ratings being considered a “Success.” We evaluated changes to the nasal bone at 3 months after reduction, using the same grade.A total of 128 patients were analyzed. The results of patients in the F1 group were better than those of other patients immediately postoperatively, whereas those of the L2 group were worse. The overall success rate was 49.2% (58/118). At 3 months postoperatively, 33 cases exhibited an improvement to a higher grade, whereas 25 cases improved from an unacceptable outcome to a successful outcome, with the overall success rate being 70.3% (83/118).Immediately postoperative CT scans can be helpful for surgeons in determining whether a secondary adjustment is necessary. Incompletely reduced nasal bone showed spontaneous improvement in bony arrangement according to our study, so simple observation could be a choice.