FIGURE 3.

Three types of load were applied in all models and micromotion of the pubic symphysis were recorded. (A) The superior segment of S1 of models was fixed. To simulate dual-leg standing, a vertical force of 500 N was distributed to the bilateral acetabulums, respectively. To simulate single-leg stance, a vertical force of 750 N was distributed to the right acetabulum. For rotation, a follower load of 500 N and a torque of 7 Nm were applied to the bilateral acetabulums to simulate right rotation. (B) The incremental micromotion of the pubic symphysis was recorded to evaluate the stability of anterior pelvic ring. The increment of horizontal displacements under dual-leg standing, the incremental vertical displacements under single-leg stance, and increment of rotational angle under rotation were described.