Relationship between bilateral humeral retroversion angle and starting baseball age in skeletally mature baseball players-existence of watershed age
Relationship between bilateral humeral retroversion angle and starting baseball age in skeletally mature baseball players-existence of watershed age
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DOI：
10.1016/j.jse.2018.10.017
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发表时间：
2019-05-01
影响因子：
3
通讯作者：
Sugimoto, Katsumasa
中科院分区：
文献类型：
--
作者：
Takenaga, Tetsuya;Goto, Hideyuki;Sugimoto, Katsumasa
背景：儿童期反复俯仰被认为限制了肱骨头的生理性去旋转过程。一些研究报道，棒球运动员肱骨后倾的两侧差异发生在9岁至11岁之间。本研究探讨了双侧肱骨后倾角和开始棒球年龄的关系，在成熟的棒球运动员。方法：117名男子棒球运动员，属于大学或业余队进行了调查。如先前研究所述，使用超声辅助技术评估双侧肱骨后倾。所有的球员被分为四组：6岁之前开始打棒球的球员，7到8岁之间，9到10岁之间和11岁之后。双侧肱骨后倾角进行了比较，在四个开始的年龄groups.Results：所有的球员开始打棒球之间的5和12岁。比较投掷臂，起始年龄组11-12（72度）的肱骨后倾明显小于其他3组（5-6、7-8和9-10组分别为81度、82度和80度）。4个起始年龄组之间的非投掷臂比较无显著性差异（第5-6、7-8、9-10和11-12组分别为71度、72度、70度和66度）。11年后开始打棒球的成熟棒球运动员，投掷臂的肱骨后倾明显小于那些开始打棒球的人。棒球11年前(C)2018肩肘外科杂志董事会。All rights reserved.
Background: Repetitive pitching in childhood was thought to restrict the physiological derotation process of the humeral head. Some studies reported that the side-to-side differences of humeral retroversion in baseball players occurred between the age of 9 and 11 years. The present study investigated the relationship between bilateral humeral retroversion angle and starting baseball age in skeletally mature baseball players.Methods: One hundred and seventeen male baseball players, who belonged to a college or amateur team, were investigated. Bilateral humeral retroversion was assessed using an ultrasound-assisted technique as described by previous studies. All players were divided into four groups: players who had started playing baseball before the age of 6 years, between 7 and 8 years, between 9 and 10 years and after 11 years. Bilateral humeral retroversion angle was compared among the four starting age groups.Results: All players started playing baseball between 5 and 12 years. Comparing the throwing arm, humeral retroversion in starting age group 11-12 (72 degrees) was significantly smaller than the other 3 groups (81 degrees, 82 degrees, and 80 degrees for groups 5-6, 7-8, and 9-10, respectively). Comparing the non-throwing arm revealed no significant differences among the 4 starting age groups (71 degrees, 72 degrees, 70 degrees, and 66 degrees for groups 5-6, 7-8, 9-10, and 11-12, respectively).Conclusions: Skeletally mature baseball players who started playing baseball after 11 years had significantly smaller humeral retroversion in the throwing arm than those who started baseball before 11 years. (C) 2018 Journal of Shoulder and Elbow Surgery Board of Trustees. All rights reserved.