Ophthalmology. 2011 Aug;118(8):1677-80. doi: 10.1016/j.ophtha.2011.05.001.
To examine the type of orbital blowout fracture and its variation with race.
Retrospective review of computed tomography (CT) scans and demography in an unselected cohort of patients with orbital blowout fractures.
Patients with a high-resolution CT scan of adequate quality for analysis who presented with an orbital blowout fracture to the Orbital Clinic at Moorfields Eye Hospital. Patients with fractures involving the orbital rim or the cranium, or with penetrating injuries of the globe or orbit, were omitted from the study.
Demographic and ethnic information was collected for each patient, and the orbital scans were reviewed by a single observer. On the basis of coronal and axial imaging, a fracture was classified as affecting up to 4 areas: the floor lateral to the infraorbital canal (area 1, "A1"), the floor medial to the canal ("A2"), the maxillo-ethmoidal strut ("inferomedial" strut, "A3"), and the medial wall blowout fracture ("A4"); with fractures involving the inferomedial strut, it was noted whether there was displacement or rotation of the strut. Ethnic origin was classified as Caucasian, Afro-Caribbean, or Asian (Oriental or Indian).
The proportion of different walls involved in orbital blowout fractures within 3 ethnic groups.
A total of 152 patients (125 men, 82%) had imaging adequate for analysis; 103 (68%) were Caucasian, 19 (12%) were Afro-Caribbean, and 30 (20%) were Asian. Caucasians most commonly had floor fractures (A1 or A2 in 56 orbits, 54%) compared with 10 of 103 purely medial fractures (A4, 10%); in contrast, medial fractures were the most common type in Afro-Caribbean patients (7/19 cases, 37%), and purely floor fractures occurred in only 2 cases (10%) (P<0.005). Asian patients had results similar to those for Caucasian patients, with isolated floor fractures being the most common (14/30 cases, 47%).
Most blowout fractures involve the orbital floor in Caucasian and Asians, whereas in Afro-Caribbeans the most common site for fracture is the medial wall.
FINANCIAL DISCLOSURE(S): The author(s) have no proprietary or commercial interest in any materials discussed in this article.
研究眶爆裂性骨折的类型及其与种族的关系。
对莫尔菲尔德眼科医院眼眶诊所就诊的眶爆裂性骨折患者的高分辨率 CT 扫描和人口统计学资料进行回顾性分析。
研究对象为接受高质量 CT 扫描并接受分析的患者，以及眼眶边缘或颅骨骨折、眼球或眼眶穿透伤的患者均被排除在外。
收集每位患者的人口统计学和种族信息，并由一名观察者对眼眶扫描进行评估。根据冠状位和轴位成像，骨折分为 4 个区域：眶下管外侧的眶底（区域 1，“A1”）、管内侧的眶底（“A2”）、上颌筛支柱（“内侧支柱”，“A3”）和内侧壁爆裂性骨折（“A4”）；内侧支柱骨折时，注意支柱是否有移位或旋转。种族分为白种人、非裔加勒比人或亚洲人（东方或印度人）。
3 个种族群体中眼眶爆裂性骨折不同壁的比例。
共 152 例患者（125 例男性，82%）有足够的影像学分析资料；103 例（68%）为白种人，19 例（12%）为非裔加勒比人，30 例（20%）为亚洲人。与单纯内侧骨折（A4，10%）相比，白种人最常见的是眶底骨折（A1 或 A2 共 56 例，54%）；相比之下，内侧骨折是非裔加勒比人最常见的类型（7/19 例，37%），单纯眶底骨折仅 2 例（10%）（P<0.005）。亚洲患者的结果与白种人相似，单纯眶底骨折最常见（A4，14/30 例，47%）。
在白种人和亚洲人中，大多数爆裂性骨折累及眶底，而在非裔加勒比人中，最常见的骨折部位是内侧壁。
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