AIM: To investigate the clinical significance and feature of intraorbital segment course in infraorbital nevrve on computed tomography(CT).

METHODS: Using three-dimensional reconstruction and CT, 101 adults with normal orbital bone were measured with the length of infraorbital canal, the vertical distance from infraorbital foramen to infraorbital margin and to median line of skull respectively, and the included angle between infraorbital canal and antetheca of the maxilla. The average had been taken after 5 times measurement to every value. SPSS 17.0 statistical software was used to the process.

RESULTS: Measurement results of 101 adults with normal orbital bone were statistically analyzed. The left infraorbital canal lengths of 53 male were 13.21±2.73mm and the right were 12.97±2.63mm; the left infraorbital canal lengths of 48 female were 12.79±2.77mm and the right was 12.72±2.70mm; the left vertical distances from infraorbital foramen to infraorbital margin of 53 male were 9.01±2.21mm and the right were 8.69±1.98mm; the left vertical distance from infraorbital foramen to infraorbital margin of 48 female were 9.33±2.18mm and the right was 9.14±2.34mm; the left vertical distances between infraorbital foramen and median line of skull of 53 male were 33.41±3.01mm and the right were 33.34±3.33mm; the left vertical distance between infraorbital foramen and median line of skull of 48 female were 32.39±4.23mm and the right were 32.33±3.78mm; the left included angle between infraorbital canal and antetheca of the maxilla of 53 male were 81.47°±11.70° and the right were 79.80°±10.38°; the left included angle between infraorbital canal and antetheca of the maxilla of 48 female were 76.04°±14.64° and the right were 76.30°±13.51°. Pair t test was used to compare the left and right side value in male and female, and the same side value in male and female. The results had no statistical differences(P>0.05).

CONCLUSION: Through the measure of the infraorbital nerve on CT, it is good for the clinical diagnosis and treatment. In the meanwhile, it can help patients to avoid the unnecessary nerve injury in the operating.