The purpose of this study was to investigate the distribution of blowout fracture sites among age groups and compare clinical factors that can affect the fracture site. The authors reviewed 330 cases of blowout fracture surgeries and included 226 eyes of 226 patients aged between 20 and 29 years and between 50 and 59 years who underwent blowout fracture reconstruction between January 2017 and December 2020, in the Department of Ophthalmology at Korea University Hospital.Medical records including patient demography, trauma etiology, and preoperative computed tomography image were evaluated. Ethmoidal cell septa and fracture site position were compared between the 2 age groups. The causes of injury were categorized into 3 groups: focal trauma, gross trauma, and other causes. Orbital floor fracture was the most common type (40.00%) in the young group, followed by medial wall fracture (25.33%). in contrast, medial wall fracture accounted for the largest proportion (42.11%) in the older group, and orbital floor fracture accounted for only 26.67%. The major cause of blowout fracture in young patients was focal trauma, whereas gross trauma was the most common cause in the older group. The number of ethmoidal cells was 4.19 ± 0.831 (2-6) in the young group and 3.91 ± 1.022 (2-6) in the old group (P < 0.05). Distribution of blowout fracture site differed between age groups, and these differences can be explained by cause of injury and number of ethmoidal cells.
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