Faculty of Health Sciences, University of Sydney, Sydney, Australia.
J Sci Med Sport. 2010 Jul;13(4):392-6. doi: 10.1016/j.jsams.2009.06.001. Epub 2009 Aug 15.
The amount of torsion in the humerus is determined by both genetic and activity-related factors, and affects the external rotation range of motion available at the shoulder. Previous research has shown athletes participating in throwing sports to have a greater amount of humeral retrotorsion in their dominant arm. The purpose of this study was to investigate the predictive ability of both the genetic and activity-related aspects of humeral torsion regarding throwing-related injury. The amount of humeral torsion in both arms of 35 high level adolescent male baseballers (mean age 16.6 years+/-0.6 years) was measured at study commencement. Significantly increased humeral retrotorsion in the dominant arm compared to the non-dominant arm was found (p=0.04). These athletes were followed for a period of 30 months, and any injury to their throwing arm which resulted in missing either a game or practice was recorded. ROC curve analysis was used to determine the predictive ability of humeral torsion with respect to the occurrence of injury to the throwing arm. Of the 35 athletes, 19 suffered a throwing arm injury. AUC values derived from ROC analysis showed humeral torsion in the non-dominant arm (AUC: 0.679, 95% CI: 0.502-0.857), as well as the average of the humeral torsion in both arms (0.692, 0.512-0.873), to be predictive of injury. Torsion in the dominant arm was not a significant throwing arm injury predictor. Thus non-dominant arm humeral torsion (the genetic contribution) was found to be the predictor of throwing arm injury.
肱骨的扭转量取决于遗传和与活动相关的因素，并影响肩部的外旋活动范围。先前的研究表明，从事投掷运动的运动员在优势臂中具有更大的肱骨后旋量。本研究旨在探讨肱骨扭转的遗传和与活动相关方面对投掷相关损伤的预测能力。在研究开始时，测量了 35 名高水平青少年男性棒球运动员（平均年龄 16.6 岁+/-0.6 岁）双臂的肱骨扭转量。发现优势臂的肱骨后旋量明显大于非优势臂（p=0.04）。这些运动员被随访了 30 个月，记录了任何导致其投掷臂受伤的情况，包括错过一场比赛或一次训练。ROC 曲线分析用于确定肱骨扭转对投掷臂受伤发生的预测能力。在 35 名运动员中，有 19 名运动员的投掷臂受伤。ROC 分析得出的 AUC 值表明，非优势臂的肱骨扭转（AUC：0.679，95%CI：0.502-0.857）以及双臂肱骨扭转的平均值（0.692，0.512-0.873）可预测受伤。优势臂的扭转量不是投掷臂受伤的显著预测因子。因此，非优势臂肱骨扭转（遗传贡献）被发现是投掷臂受伤的预测因子。
