Lateral extra articular The more common lateral extra articular type of snapping hip syndrome occurs when the iliotibial band, tensor fasciae latae, or gluteus medius tendon slides back and forth across the greater trochanter.
Medial extra-articular Less commonly, the iliopsoas tendon catches on the anterior inferior iliac spine (AIIS), the lesser trochanter, or the iliopectineal ridge during hip extension, as the tendon moves from an anterior lateral (front, side) to a posterior medial (back, middle) position.