Fig. 3

Shown are 2-dimensional pictorial representations of varying degrees of PO portrayed by views of the pelvis in the coronal plane. Depiction in this way simulates the AP radiographic view of the pelvis commonly used to measure LLD in the clinical setting. Each depiction demonstrates one of the four levels of PO assessed with our Sawbones model. To establish neutrality (PO of zero), a level horizontal axis bisecting the inferior aspects of the ischial tuberosities was established. All other levels of obliquity (5°, 10°, and 15°) were produced with reference to this horizontal axis. Note that for the purposes of our assessment, the right side of the pelvis is considered the higher side, while the left is considered the lower side. At each of the four pelvic obliquities shown, four levels of femoral abduction (0°, 5°, 10°, 15°) and adduction (0°, 5°, 10°, 15°) were evaluated