D E O'Briain1, P H Dawson2, J C Kelly1, P Connolly1. 1. Children's University Hospital, Temple Street, Dublin 1, Ireland. 2. Children's University Hospital, Temple Street, Dublin 1, Ireland. peterhughdawson@gmail.com.
Abstract
BACKGROUND: 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. AIMS: We aimed to assess if the ratio correlates to skeletally immature patient aggression. METHODS: 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. RESULTS: 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). CONCLUSIONS: 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.
BACKGROUND: 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. AIMS: We aimed to assess if the ratio correlates to skeletally immature patientaggression. METHODS: 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. RESULTS: 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). CONCLUSIONS: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.
Entities:
Keywords:
Aggression; Boxer’s fracture; Digit ratio; Fracture; Hand
Authors: Bernd Lenz; Anna Eichler; Eva Schwenke; Verena N Buchholz; Charlotte Hartwig; Gunther H Moll; Karin Reich; Christiane Mühle; Bernhard Volz; Adriana Titzmann; Matthias W Beckmann; Hartmut Heinrich; Johannes Kornhuber; Peter A Fasching Journal: Geburtshilfe Frauenheilkd Date: 2018-12-14 Impact factor: 2.915