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[Purpose] The purpose of this study was to identify the relationship between the range of hip internal rotation and femoral structure. [subjects and Methods] The subjects were 23 high school baseball players, and both hips were examined. The range of hip internal rotation in 90° of hip flexion (HIF) and 0° of hip extension (HIE) were evaluated. in the examination of femoral structure femoral anteversion angle was measured by MRi and the Craig test, a -angle were measured by MRI. [Results] Correlation analysis suggested relationships between HIF and HIE, and femoral anteversion. There was no association between HIF and the α-angle; however, a relationship between HIE and the α-angle was found. There was no association between femoral anteversion angle and α-angle, and asymetric hip internal rotation. [Conclusion] The results of this study show there are positive correlations between HIF and HIE, and femoral anteversion. however, asymmetry of the hip internal rotation was not due to femoral structure of high school baseball players.

Effect of Femoral Structure on Hip Internal Rotation of High School Baseball Players