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(English captions by Andrea Matsumoto from the University of Michigan)

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To perform O'Brien's Test point the thumb
down and flex shoulder to 90 degrees.

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Adduct the arm across midline, provide resistance
against further shoulder flexion and evaluate

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for pain.

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Repeat with the thumb pointing up and again
evaluate for pain.

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If pain was present with the thumb down but
relieved with the thumb up, it is considered

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a positive test, suspicious for a labral tear.