Department of Anthropology, Faculty of Literature, Cumhuriyet University, Sivas, Turkey.
Am J Hum Biol. 2012 Jul-Aug;24(4):436-40. doi: 10.1002/ajhb.22240. Epub 2012 Feb 5.
The effects of extreme behavioral lateralization (i.e., extreme handedness) on the epicondylar breadth are poorly understood. This study was conducted in order to determine the effects of high levels of right- and left-handedness on epicondyle of the humerus.
Elbow width of 186 healthy male university students who completed their physical development (extreme left handed = 92, mean age = 18.67, SD = 0.61; extreme right handed = 94, mean age = 18.55, SD = 0.58) were measured with 0.01 mm sensitivity and Edinburgh Handedness Inventory was applied to determine the handedness of the individuals. Participants with scores of +100 were designated as extreme right-handers, and participants with scores of -100 were designed as extreme left-handers.
According to the findings, the degree of directional asymmetry was +1.22 (SD = 2.24) in the extreme right handed, whereas in extreme left handed -0.59 (SD = 1.74). The relative deviation percentage in the extreme right handed was 3.1% whereas 2.2% in the extreme left handed.
It could be stated that extreme handedness has an influence on the asymmetry of epicondyle of the humerus; nevertheless, this effect is more significant in the extreme right handed. This is likely to result from the necessity for left-handed people to adapt themselves to the conditions of a dominantly "right-handed" world.
极端行为侧化（即极度惯用手）对面肱骨髁宽度的影响知之甚少。本研究旨在确定高水平的右撇子和左撇子对肱骨髁的影响。
186 名健康男性大学生完成身体发育后（极度左撇子=92 人，平均年龄=18.67，SD=0.61；极度右撇子=94 人，平均年龄=18.55，SD=0.58），使用 0.01mm 灵敏度测量其肘部宽度，并应用爱丁堡手性量表确定个体的手性。得分在+100 被指定为极端右撇子，得分在-100 被指定为极端左撇子。
根据研究结果，在极度右撇子中，方向不对称的程度为+1.22（SD=2.24），而在极度左撇子中为-0.59（SD=1.74）。极度右撇子的相对偏差百分比为 3.1%，而极度左撇子的相对偏差百分比为 2.2%。
可以说，极端的惯用手会对面肱骨髁的不对称性产生影响；然而，这种影响在极度右撇子中更为显著。这可能是因为左撇子的人必须适应一个主要是“右撇子”的世界的条件。
