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Inferior Glenohumeral Ligament

The IGHL functions as the primary restraint to anterior, posterior, and inferior glenohumeral translation between 45 degree and 90 degree elevation of the arm. The IGHL originates from the inferior half of the glenoid neck or the anterior-inferior labrum, to insert inferior to the MGHL on the lesser tuberosity.

The IGHL forms a hammocklike structure with discrete anterior and posterior bands with an interposed pouch. This formation allows for reciprocal tightening and loosening, depending on arm position. In external rotation, the complex moves anteriorly; in internal rotation, the complex moves posteriorly.

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