O'Briain D E, Dawson P H, Kelly J C, Connolly P
Children's University Hospital, Temple Street, Dublin 1, Ireland.
Ir J Med Sci. 2017 May;186(2):441-445. doi: 10.1007/s11845-016-1524-5. Epub 2016 Nov 1.
The 2D:4D ratio is a sexually dimorphic trait. A lower ratio is correlated with sporting prowess, successful financial trading, risk taking behaviour, aggression, and aggression-related injuries, such as the fifth metacarpal fractures.
We aimed to assess if the ratio correlates to skeletally immature patient aggression.
Radiology reports were searched for the terms "5th metacarpal" or "boxer". Of 537 X-rays, 142 had fractures. The mechanism of injury was recorded in 102 patients, differentiating aggressive and non-aggressive injury groups. Bone age and chronological age were recorded.
A clear male preponderance for aggression was identified with only 60% of non-aggressive injuries occurring in males compared to 95% in the aggression group (p < 0.001). Patients with aggression injuries were older chronologically (14.6 vs 12.7, p < 0.001) and by bone age (14.5 vs 13.0, p < 0.001). For male patients, there was no difference in the 2D:4D ratio (p = 0.94); however, for females, the difference was significant (p = 0.04).
Aggression injuries occur at an older age and are more common in males. In the female cohort, there was a distinct difference in digit ratio.
2D:4D比例是一种性别二态性特征。较低的比例与运动能力、成功的金融交易、冒险行为、攻击性以及与攻击相关的损伤（如第五掌骨骨折）相关。
我们旨在评估该比例是否与骨骼未成熟患者的攻击性相关。
在放射学报告中搜索“第五掌骨”或“拳击手”等术语。在537张X光片中，有142张存在骨折。记录了102例患者受伤的机制，区分了攻击性行为导致的损伤组和非攻击性行为导致的损伤组。记录了骨龄和实际年龄。
确定攻击性行为明显以男性为主，非攻击性行为导致的损伤中只有60%发生在男性，而攻击性行为导致的损伤组中这一比例为95%（p<0.001）。因攻击性行为受伤的患者实际年龄更大（14.6岁对12.7岁，p<0.001），骨龄也更大（14.5岁对
13.0岁，p<0.001）。对于男性患者，2D:4D比例没有差异（p = 0.94）；然而，对于女性患者，差异显著（p = 0.04）。
攻击性行为导致的损伤发生在年龄较大的患者中，且在男性中更为常见。在女性队列中，指骨比例存在明显差异。
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