External Rotation Lag Sign
- External Rotation Lag Sign is used to test the Integrity of the supraspinatus and infraspinatus tendons
- The patient is seated with his or her back to the examiner.
- The elbow is passively flexed to 90 degrees, and the shoulder is held at 20 degrees of elevation and near maximal external rotation (maximal external rotation minus 5 degrees to avoid elastic recoil in the shoulder) by the examiner.
- The patient is asked to maintain the position of external rotation actively as the examiner releases the wrist, while maintaining support of the arm at the elbow
- External Rotation Lag Sign is positive when a lag, or angular drop, occurs
- Sensitivity: 56 %
- Specificity: 98 %