The anterior inferior iliac spine is a bony eminence on the anterior border of the hip bone, or, more precisely, the wing of the ilium.
Hip joint. Lateral view. Anterior inferior iliac spine visible to the left.
Iliofemoral ligament
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The iliofemoral ligament is a thick and very tough triangular capsular ligament of the hip joint situated anterior to this joint. It attaches superiorly at the inferior portion of the anterior inferio
A front split requires mobility in the ligament to adequately extend the rear hip joint.
Front oversplits require even more mobility to attain proper hip hyperextension.