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首页> 外文期刊>Journal of shoulder and elbow surgery >Humeral retroversion and its association with posterior capsule thickness in collegiate baseball players
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Humeral retroversion and its association with posterior capsule thickness in collegiate baseball players

机译：高校棒球运动员的肱骨逆行及其与后囊厚度的关系

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Hypothesis and background: Baseball players commonly present with decreases in internal rotation (IR) and concurrent increases in external rotation (ER) motion. Several glenohumeral (GH) adaptations have been theorized to cause these changes in motion, including humeral retroversion (HR) and posterior capsule thickness (PCT). However, limited data exist examining the inter-relationship between HR and PCT. Therefore, the purpose of this study was to measure HR, GH IR and ER rotation, and PCT. Materials and methods: HR and PCT were measured with an ultrasound system (Sonosite Titan; Sonosite, Bothell, WA, USA), and GH IR and ER were measured with a digital inclinometer. Results: The dominant arm had significantly more HR (15.6°, P = .0001) than the nondominant arm. Pearson correlation coefficients showed a significant negative relationship between HR and GH IR (-0.472, P = .001) and a significant positive relationship between HR and GH ER (0.295, P = .042). A significant positive correlation was also found between HR and PCT (0.427, P = .003). Discussion: This was the first study to identify a relationship between HR and PCT in addition to GH IR and ER. The identification of these multiple correlations appears to suggest that the loss of IR caused by HR may be placing additional stress on the posterior capsule during the deceleration phase of the throw, thereby causing a fibroblastic healing response. Conclusions: HR has previously been identified as a positive adaptation because of the increase in ER without anterior capsule attenuation. However, this study suggests that HR may be contributing to the negative adaptation of PCT.
机译：假设和背景：棒球运动员通常会出现内部旋转（IR）减少和外部旋转（ER）运动同时增加的现象。从理论上说，几种肱骨头适应症（GH）可以引起这些运动改变，包括肱骨逆行（HR）和后囊厚度（PCT）。但是，检验HR与PCT之间相互关系的数据有限。因此，本研究的目的是测量HR，GH IR和ER旋转以及PCT。材料和方法：HR和PCT用超声系统（Sonosite Titan; Sonosite，博塞尔，华盛顿州，美国）测量，GH IR和ER用数字测斜仪测量。结果：优势臂的HR（15.6°，P = .0001）明显高于非优势臂。皮尔逊相关系数显示HR与GH IR之间显着负相关（-0.472，P = .001），而HR与GH ER之间显着正相关（0.295，P = .042）。在HR和PCT之间也发现了显着的正相关（0.427，P = .003）。讨论：这是首次确定GH IR和ER之外，HR和PCT之间关系的研究。这些多重相关性的鉴定似乎表明由HR引起的IR丧失可能在投掷的减速阶段向后囊施加了额外的压力，从而引起了成纤维细胞的愈合反应。结论：HR先前已被确定为阳性适应症，因为ER增加而前囊未衰减。但是，这项研究表明，HR可能会导致PCT的负面适应。

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