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[Purpose] To examine and compare the effectiveness of three self-stretch methods for secondary internal rotation limitation in injured throwing shoulders. [Subjects] Forty-eight baseball players with injured throwing shoulders. [Methods] First, inability to perform the APS, CB, and IRS stretch methods due to pain were compared among the subjects. Then, the 28 cases who could perform all of the stretch methods were divided into 3 groups, and excluding the effect of the retroversion angle, the secondary internal rotation angle was measured before and after stretch performance and compared among the groups. [Results] The inability to perform stretching due to pain was significantly the lowest for the APS method. There were no significant differences in the secondary internal rotation angle among the groups before stretching, but after stretching, those of the groups performing the APS and CB methods were significantly larger than that of the IRS method group. [Conclusion] The results suggest that the APS method is the most effective self-stretch method for injured throwing shoulders.

Comparison of Self-stretch Methods for Secondary Internal Rotation Limitation in Injured Throwing Shoulders: Evaluation of the Direct Effect