Sulcus Sign

Sulcus Sign is used to test for Multidirectional Instability (MDI)

have the patient stand relaxed with their arms at their side.
Grab their affected arm and pull it inferiorly.

If there is a sulcus that forms at the superior aspect of the humeral head, the test is positive.
Sulcus is considered positive if it stays increased (2+ or 3+) with ER at side (pathologic rotator interval)

Sensitivity: 28 %
Specificity: 97 %

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