title: Change of the orbital volume ratio in pure blow-out fractures depending on fracture location.
abstract: The purposes of this study were to observe bony orbital volume (OV) changes in pure blow-out fractures according to fracture location using a facial computed tomographic scan and to investigate whether the OV measurements can be used as a quantitative value for the evaluation of the surgical results of the acute blow-out fracture.Forty-five patients with unilateral pure blow-out fracture were divided into 3 groups: inferior (group I), inferior medial (group IM), and medial (group M) orbital wall fracture. The OV and the orbital volume ratio (OVR) were prospectively measured before and 6 months after surgery with the use of 3-dimensional computed tomographic scans, and the Hertel scale was measured with a Hertel exothalmometer.The preoperative OVR increased to the greatest extent in group IM, and the mean preoperative OVR was 121.46. The mean preoperative OVR in group I was significantly higher than that of group M (P = 0.005). The OV and OVR revealed a statistically significant decrease after the surgery (P = 0.000). The Hertel scale improved from -1.04 mm before the surgery to -0.78 mm after the surgery, but no significant difference was observed (P = 0.051).The OVR was useful as a quantitative value to evaluate pure blow-out fractures, compared with that of the Hertel scale. Fracture location-associated OVR studies are needed to make volume guidelines of blow-out fracture surgery.
authors.affiliation: From the Department of Plastic and Reconstructive Surgery, Dankook University Hospital, Cheonan, Republic of Korea.
authors.forename: Sang Ah
authors.initials: SA
authors.lastname: Oh
authors.forename: Jae Ho
authors.initials: JH
authors.lastname: Aum
authors.forename: Dong Hee
authors.initials: DH
authors.lastname: Kang
authors.forename: Ja Hea
authors.initials: JH
authors.lastname: Gu
mesh_terms: D000293:Adolescent; D000328:Adult; D015841:Enophthalmos / Q000000981:diagnostic imaging; D005094:Exophthalmos / Q000000981:diagnostic imaging; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008875:Middle Aged; D009915:Orbit / Q000000981:diagnostic imaging* / Q000601:surgery; D009917:Orbital Fractures / Q000145:classification / Q000000981:diagnostic imaging* / Q000601:surgery; D009929:Organ Size; D011446:Prospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods; D055815:Young Adult