The inferior band of the iliofemoral ligament runs from the anterior inferior iliac spine to the intertrochanteric line inferior to the superior band, converging to form the base of the Y shape.
Resists hip external rotation and hyperextension, contributes to the inferior stability of the hip capsule during extension activities, and is the inferior component of the strongest hip ligament.
The inferior iliofemoral band is at risk during anterior approaches to the hip — the Smith-Petersen and direct anterior approaches require careful identification of this band to avoid inadvertent capsular damage that predisposes to post-operative instability.
The inferior band of the Y ligament is identified and preserved during direct anterior hip arthroplasty to maintain anterior capsular integrity and reduce anterior dislocation risk.
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