Postural Restoration Institute Practice Test

In PRI, the most important reference center is the left internal obliques and Transversus Abdominis teamed with the left posterior lower rib cage because this pair anchors the thoraco-pelvic cylinder that guides the entire left-sided posture. Activating the left IO/TA helps create a stable, inwardly braced core, while positioning the left posterior lower ribs supports the rib cage in a orientation that accommodates the pelvis to balance and rotate appropriately. This combination provides the strongest, most consistent cue for aligning the rib cage over the pelvis and driving the left pattern (often described as the left AIC side of the system), making it the central reference point clinicians rely on for retraining and cueing. Other reference points, like a particular foot bony landmark, a specific rib position on the opposite side, or a hip capsule cue, can be helpful in certain drills or as secondary cues, but they do not exert the same overarching influence on the rib-pelvis relationship and dynamic as the left IO/TA with the left posterior lower ribs.