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Pelvic Incidence Changes Between Flexion and Extension.

Nicholas Schroeder1, Andriy Noschenko1, Evalina Burger1

  • 1Department of Orthopedics, University of Colorado Anschutz Medical Campus, 12631 E. 17th Ave., Mail Stop B202, Aurora, CO 80045, USA.

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|October 24, 2018
PubMed
Summary
This summary is machine-generated.

Pelvic incidence (PI) is not static; it changes with spinal flexion and extension, primarily due to sacral slope variations. Obesity further influences these dynamic changes in PI.

Keywords:
Lumbar lordosisPelvic incidencePelvic tiltSacral slope

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Area of Science:

  • Spinal biomechanics
  • Radiographic analysis
  • Orthopedic surgery

Background:

  • Pelvic incidence (PI) traditionally viewed as a static parameter.
  • Recent evidence suggests PI can change with age and post-spinal procedures.
  • Positional changes in PI have not been previously investigated.

Purpose of the Study:

  • To investigate dynamic changes in pelvic incidence (PI) from spinal flexion to extension.
  • To evaluate interobserver reliability in measuring PI and associated spinal parameters.

Main Methods:

  • Retrospective analysis of 72 patients with flexion and extension lumbar spine radiographs.
  • Measurement of pelvic incidence (PI), pelvic tilt (PT), sacral slope (SS), and lumbar lordosis in both positions.
  • Analysis of parameter variations and interobserver reliability.

Main Results:

  • Pelvic incidence (PI) demonstrated significant changes between flexion and extension (mean decrease of -0.94°, p < .044).
  • Sacral slope (SS) variations were the primary driver of PI changes (p > .001).
  • Obesity was significantly associated with greater PI changes between positions (p = .003).

Conclusions:

  • Pelvic incidence (PI) is a dynamic parameter influenced by spinal position.
  • Sacroiliac joint mobility, reflected in sacral slope (SS) changes, is the main factor in PI variability.
  • Obese individuals exhibit more pronounced dynamic changes in pelvic incidence (PI).