Computer-assisted orthopedic surgery and patient-specific instruments are widely used in orthopedic fields that utilize contralateral side bone data as a template to restore the affected side bone. The essential precondition for these techniques is that the left and right bone features are similar. Although proximal humerus fracture accounts for 4% to 8% of all fractures, the bilateral asymmetry of the proximal humerus is not fully understood. The aim of this study is to investigate anthropometric differences of the bilateral proximal humerus. One hundred one pairs of Korean humerus CT data from 51 females and 50 males were selected for this research. To investigate bilateral shape differences, we divided the proximal humerus into three regions and the proximal humerus further into five sections in each region. The distance from the centroid to the cortical outline at every 10 degrees was measured in each section. Differences were detected in all regions of the left and right proximal humerus; however, males had a larger number of significant differences than females. Large bilateral differences were measured in the greater tubercle. Nevertheless, using contralateral data as a template for repairing an affected proximal humerus might be possible.

中文翻译：

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朝鲜族人群近端肱骨详细不对称性的形态计量学评价

计算机辅助骨科手术和患者专用仪器广泛用于利用对侧侧骨数据作为模板恢复患侧骨的骨科领域。这些技术的基本前提是左右骨骼特征相似。尽管肱骨近端骨折占所有骨折的4％至8％，但肱骨近端的双侧不对称性尚未得到充分理解。这项研究的目的是调查双侧肱骨近端的人体测量学差异。本研究选择了51对女性和50对男性中的101对韩国肱骨CT数据。为了研究双边的形状差异，我们将肱骨近端分为三个区域，肱骨近端在每个区域中进一步分为五个部分。在每个部分中测量每10度从质心到皮质轮廓的距离。在左侧和右侧肱骨近端的所有区域均检测到差异。但是，男性比女性具有更大的显着差异。在较大的结节中测量到较大的双侧差异。尽管如此，使用对侧数据作为修复受影响的肱骨近端的模板还是可能的。