Which instability is assessed by sulcus sign?

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Study for the NATA BOC Domain 2 Clinical Evaluation and Diagnosis Test. Utilize our comprehensive flashcards and multiple-choice quiz features; each question comes with hints and thorough explanations. Prepare effectively for your certification exam!

Multiple Choice

Which instability is assessed by sulcus sign?

Explanation:
The sulcus sign specifically assesses inferior instability of the shoulder. By applying downward traction to the arm with the patient relaxed, the humeral head can shift downward if the inferior capsule and ligaments are lax, producing a visible or palpable sulcus just below the acromion. A pronounced sulcus indicates inferior instability, which is a hallmark of multidirectional instability involving the inferior aspect of the glenohumeral joint. This is different from tests that probe anterior stability (which stress the front capsule), posterior stability (which test the back and posterior structures), or superior instability, which is uncommon.

The sulcus sign specifically assesses inferior instability of the shoulder. By applying downward traction to the arm with the patient relaxed, the humeral head can shift downward if the inferior capsule and ligaments are lax, producing a visible or palpable sulcus just below the acromion. A pronounced sulcus indicates inferior instability, which is a hallmark of multidirectional instability involving the inferior aspect of the glenohumeral joint. This is different from tests that probe anterior stability (which stress the front capsule), posterior stability (which test the back and posterior structures), or superior instability, which is uncommon.

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