APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Movement of the pelvis which keeps the center of gravity from excessive movement up or down is called: Vertical pelvic shift.

Detailed explanation-2: -With the trunk held relatively stationary, contraction of the hip extensors and abdominal muscles (with the exception of the transverse abdominis22) functions as a force-couple to posteriorly tilt the pelvis (FIGURE 4).

Detailed explanation-3: -Following initial contact, the pelvis tilts posteriorly for less than 20% of the gait cycle. It then begins to tilt anteriorly again until the contralateral foot contacts the ground at approximately 50% of the gait cycle. The cycle then repeats itself, tilting posteriorly, and anteriorly again.

Detailed explanation-4: -Conversely, posterior pelvic tilt occurs when the ASIS move posteriorly and superiorly while the PSIS move inferiorly.