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KMID : 1023920100120030089
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Journal of the Korean Academy of Kinesiology
2010 Volume.12 No. 3 p.89 ~ p.96
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The Relationships of Humerus Retroversion and Range of Motion associated with Baseball Career in the Throwing Shoulder
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Kim Yong-Kweon
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Abstract
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INTRODUCTION: The purpose of this study was to evaluate the relationships of humerus retroversion and range of motion associated with baseball career in the throwing shoulder.
METHOD: Twenty-six baseball players were evaluated in this study. They have no pain and have registrated as an athlete in korean baseball association. Players were divided into 3 groups based on length of baseball career(Group1: career under 6years, Group2: career 7~9years, G3: over 10 years career). Retroversion was calculate by using method of the So¨derlund et al.
RESULT: There was significant difference in retroversion and glenohumeral range of motion between the throwing and nonthrowing shoulders. ROM of the shoulder internal rotation in Group2 was significantly greater than that in Group1. ROM of the shoulder external rotation in Group2 was significantly greater than that in Group3. In Retroversion of the Humerus, Group2 and Group3 was significantly greater than that in Group1, and correlation coefficients were significantly high between retroversion and baseball career. That is when the athlete having been 7~9years career of baseball, Retroversion showed peak level. However, Althrough the career have passed over 10years, there was not increasing of retroversion any more.
CONCLUSION: The ROM of internal and external rotation in the throwing shoulder were significantly greater than that in nonthrowing shoulder. ROM of internal and external rotation in the players having 7 to 9 years of career were the highest than that in other groups. Whereas retroversion of the humerus was increasing as go on the length of baseball career. But no more increasing after 10 years career. there was significant correlation between retroversion and baseball career.
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KEYWORD
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Baseball, ROM, Retroversion, Internal Rotation, External Rotation
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