Experimental study of the sacroiliac joint micromotion in pelvic disruption.

Objective: To measure the sacroiliac (SI) joint micromotion when different ligamentous lesions are created to simulate various degrees of pelvic anteroposterior compression injury.

Design: Cadaveric study.

Materials And Method: Six SI joints were studied using a special device that made it possible to vary up to 310 N the loads applied on the ischial tuberosity and to measure simultaneously the SI micromotion.