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In this video, the Lateral Rotation Lag Sign, also known as the Infraspinatus spring back test, is discussed to assess pain or weakness in the Infraspinatus or Teres Minor muscles. A study by Castoldi et al. (2009) found the Lag Sign to have a sensitivity of 97% and a specificity of 93% for full thickness tears 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, position the patient's shoulder at 90 degrees of abduction and maximal external rotation, then ask them to hold this position. A negative test is indicated if the patient can hold the position, while a positive test occurs if the arm springs back anteriorly, suggesting weakness or pain in the involved muscles.