[Measurement of the globe proptosis by CT and its accuracy in patients with unilateral orbital fracture].
OBJECTIVE
To evaluate the accuracy of measurement of the globe proptosis by CT in patients with unilateral orbital fracture.


METHODS
25 patients with unilateral orbital fracture were included. CT was performed before and after operation. The globe proptosis on the unaffected side was measured before and after operation by using Hertel exophthalmometer (HE), CT images with orbital lateral rim (OLR) and the optic nerve foramen (ONF) as reference points. The accuracy was evaluated comparably by statistical analyses.


RESULTS
The preoperative and postoperative average globe proptosis were (13.9 +/- 3.1) mm and (12.5 +/- 2.2) mm in HE group, (16.1 +/- 2.6) mm and (15.7 +/- 2.3) mm in the OLR group, (45.3 +/- 4.8) mm and (46 +/- 3.9) mm in the ONF group, showing a significant difference between the pre-and post-operative results in HE group, but not in OLR and ONF groups.


CONCLUSIONS
CT measurement with the orbital lateral rim as reference point is more reliable than Hertel exophthalmometer measurement for globe proptosis.
Zhang
Zhi-Yong
ZY
Outpatient Department, Peking University School and Hospital of Stomatology, Beijing 100034, China.
Zhang
Yi
Y
He
Yang
Y
An
Jin-Gang
JG
D000293:Adolescent; D000328:Adult; D005094:Exophthalmos / Q000000981:diagnostic imaging*; D006801:Humans; D008875:Middle Aged; D009915:Orbit / Q000000981:diagnostic imaging; D009917:Orbital Fractures / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult