愛知県内少年野球チームの肩関節および肘関節のメディカルチェック

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The purposes of this study are to clarify when and which characteristics that have been supposed to be the cause of "baseball shoulders" such as instability, subacromial impingement and SLAP lesions observed in adults develop them. We had medical check of forty juvenile baseball players (av.12.3 years). They belong to the same baseball club in Aichi prefecture. One senior sports doctor measured range of motion and examine tenderness points, sings and laxities of the bilateral shoulder and elbow joints. External rotation of the first position of the dominant side was significantly greater than that of the non-dominant side. External rotation of the third position of the dominant side was significantly greater than that of the non-dominant side and internal rotation of the third position of the dominant side was significantly less than that of the non-dominant side. There ware little pathological signs in shoulder and elbow joints of these juvenile baseball players. One player showed positive anterior load and shift test of the shoulder of dominant side and six showed those of non-dominant side. Seven players showed positive posterior load and shift test of the shoulders of dominant side and fifteen showed those of non-dominant side. Five players showed positive sulcus signs of the shoulders of dominant side and eight showed those of non-dominant side. The nine players who had positive sulcus signs on either dominant or non-dominant side had significantly less internal rotation of the third position than the other players. Whereas the eighteen players who had positive posterior laxity on either dominant or non-dominant side didn't have significantly less internal rotation of the third position than the other players. Positive sulcus sign suggests inferior laxity. This means inferior laxity has different role on developing posterior tightness of the throwing shoulder from posterior laxity.
中京大学の論文

愛知県内少年野球チームの肩関節および肘関節のメディカルチェック

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