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  • Title: Reliability of intraoperative navigation in restoring normal orbital dimensions.
    Author: Markiewicz MR, Dierks EJ, Potter BE, Bell RB.
    Journal: J Oral Maxillofac Surg; 2011 Nov; 69(11):2833-40. PubMed ID: 21474226.
    Abstract:
    PURPOSE: To assess the reliability and effectiveness of intraoperative navigation in restoring normal orbital and globe dimensions in traumatic and postablative orbital defects. MATERIALS AND METHODS: To address the research purpose, the investigators initiated a retrospective cohort study and enrolled a sample of subjects that underwent primary or secondary reconstruction for unilateral orbital deformities secondary to traumatic injury or tumor surgery during the study enrollment period. Using computed tomographic datasets, pre- and postoperative orbital volume and globe projection were measured using Analyze software (Mayo Clinic Biomedical Imaging Resource, Rochester, MN). Intraclass correlation coefficient (ICC) was used to evaluate the reliability between preoperative unaffected orbit and the postoperative affected orbital and globe dimensions. A matched pairs t test was used to assess the difference in pre- and postoperative orbital volume and globe projection. RESULTS: The sample was composed of 23 subjects that underwent orbital reconstruction secondary to traumatic of postablative defects. There was a linear and reliable relationship between preoperative unaffected and postoperative affected orbital volumes (ICC, 0.67; 95% CI, 0.37 to 0.86), and preoperative unaffected and postoperative affected globe projections was high (ICC, 0.87; 95% CI, 0.69 to 0.94). There was a significant difference in pre- and postoperative mean orbital volume (30.6 vs 25.5 cm(3), P ≤ 0.001), and pre- and postoperative globe projection (51.2 vs 53.6 mm, P ≤ 0.001). CONCLUSIONS: The results of this study suggest that intraoperative navigation-assisted orbital reconstruction is reliable in restoring orbital volume and globe projection to pretraumatic and preablative conditions.
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