青少年棒球選手手肘內側疼痛與肩關節旋轉活動度之關係

The Relationship between Medical Elbow Pain and Shoulder Rang of Motion in Adolescent Baseball Players

背景：手肘內側疼痛在青少年棒球選手中是常的問題，在投球的過程中會造成肘部細微的傷害，這些細微傷害累積到一定的程度便會造成手肘的受傷。為了避免在手肘內側產生過大的張力，肩膀會利用內轉產生交替作用以減少手肘外翻的力矩，但是在許多的棒球選手身上我們卻發現常有過多的肩膀外轉以及肩膀內轉減少的現象。目的：探討青少年棒球選手手肘內側疼痛與肩關節旋轉活動度間是否有相關性。方法：招募28位有手肘內側疼痛至少一週的青少年棒球選手（疼痛組）與28位手肘內側沒有疼痛的青少年棒球選手（對照組），利用Micro FET3測量其肩膀內轉及外轉主動關節活動度。本研究以SP SS統計軟體16.0計算出肩內轉及外轉主動關節活動度的平均值及標準差，利用獨立樣本t檢定比較兩組選手在肩內轉及外轉主動關節活動度，並探討活動度與手肘內側疼痛的關係。上述統計分析的α值皆設為0.05。結果：在有手肘疼痛的青少年棒球選手與沒有手肘疼痛的青少年棒球選手兩組的比較中，肩關節內轉活動度具有組間差異，疼痛組的肩關節內轉活動度皆較對照組小。結論：青少年棒球選手手肘疼痛與肩關節之內轉活動度之減少具有相關性。

Background: Medial elbow pain (MEP) is a common problem that could affect the performance of adolescent baseball players. For pitchers, cumulative microtrauma as the result of a repetitive throwing motion may result in elbow injuries. To avoid the medial compartment being overstretched, decreased elbow varus torque is produced by internal rotation of the shoulder. Although increased shoulder external rotation (ER) and decreased shoulder internal rotation (IR) were found in most baseball players, the relationship between MEP and shoulder range of motion (ROM) has not been rigorously investigated. Purpose of the study To determine the relationship between MEP and shoulder ROM in adolescent baseball players. Methods: Twenty-eight adolescent baseball pitchers with MEP for at least 1 week (the elbow pain group) and 28 without MEP (the comparison group) were recruited in this study. Active ROM (shoulder IR and ER) of both arms of the subjects was measured. Results: Significantly negative correlations were found between shoulder IR and MEP. Conclusion: Adolescent baseball pitchers with MEP demonstrated less shoulder IR mobility than did those without pain.