Can the Relationship between Pelvic Incidence, Pelvic Tilt and Sacral Slope be Affected by Changing Pelvic Position?

BACKGROUND CONTEXT: It is typically accepted that pelvic incidence (PI) is fixed for an individual, but recent evidence suggests it may change with age and sagittal pelvic rotation. Our previous research data, taken from measures with a healthy population, supports the latter. If PI, which is composed of pelvic tilt (PT) and sacral sulcus (SS), is not fixed, then PT and/or SS must also be changing. The relationship between these parameters that occurs with pelvic movement has not been studied.

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