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In this video Im going to talk about the Lateral Rotation Lag Sign Also known as Infraspinatus spring back test in order to assess for pain or weakness in the Infraspinatus or Teres Minor muscle in a prospective cohort study done by Castoldi et al. (2009) the Lag Sign had a sensitivity of 97% and a specificity of 93% for full thickness tails of the infraspinatus and a sensitivity of 100% and a specificity of 93% for full thickness tears of the teres minor to perform the test bring your patient shoulder in to 90 degrees of Abduction and maximal external rotation and ask your patient to hold this position If your patient is able to hold this position this indicates a negative test for a positive test however Your patient would not be able to hold this position and his arm with spring back anteriorly Indicating that the teres minor and the infraspinatus are weak or painful OK, this was our video on the Lag Sign for Infraspinatus or Teres Minor weakness or pain I hope this video was help