The Sulcus Sign test assesses laxity in which structure?

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Multiple Choice

The Sulcus Sign test assesses laxity in which structure?

Explanation:
The Sulcus Sign is about inferior laxity of the glenohumeral joint. When you apply downward traction to the arm with the patient relaxed, a visible indentation or sulcus beneath the acromion indicates that the inferior portion of the joint capsule is lax, particularly the inferior glenohumeral ligament. This laxity allows more inferior translation of the humeral head, which is what the sign demonstrates. The superior glenohumeral ligament sits on the top of the capsule and does not produce this inferior sulcus when traction is applied; the bicipital tendon and the AC joint capsule aren’t the structures this test targets. So, the sign primarily reflects laxity of the inferior GH capsule and its IGHL.

The Sulcus Sign is about inferior laxity of the glenohumeral joint. When you apply downward traction to the arm with the patient relaxed, a visible indentation or sulcus beneath the acromion indicates that the inferior portion of the joint capsule is lax, particularly the inferior glenohumeral ligament. This laxity allows more inferior translation of the humeral head, which is what the sign demonstrates. The superior glenohumeral ligament sits on the top of the capsule and does not produce this inferior sulcus when traction is applied; the bicipital tendon and the AC joint capsule aren’t the structures this test targets. So, the sign primarily reflects laxity of the inferior GH capsule and its IGHL.

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