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Related Concept Videos

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The vertebral column or spine is a flexible column that supports the head, neck, and body and  allows for their movements. It also protects the spinal cord.
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Related Experiment Video

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Segmental Contributions to Lumbar Lordosis: A Computed Tomography Study.

Joseph F Baker1,2, Peter A Robertson3

  • 1Department of Orthopaedic Surgery, Waikato Hospital, Hamilton, New Zealand.

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|February 9, 2021
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Summary

Vertebral body lordosis contribution to lumbar lordosis varies with pelvic incidence (PI). Proximal segments show greater bone contribution with higher PI, impacting spinal alignment restoration.

Keywords:
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Area of Science:

  • Spine biomechanics
  • Radiographic analysis
  • Lumbar spine anatomy

Background:

  • Lumbar lordosis is crucial for spinal alignment.
  • Understanding segmental contributions to lordosis is important.
  • Pelvic incidence (PI) influences spinal curvature.

Purpose of the Study:

  • Determine individual vertebral body lordosis contribution to overall lumbar lordosis.
  • Establish the relationship between vertebral body lordosis and pelvic incidence (PI).

Main Methods:

  • Computed tomography (CT) scans of 102 patients without radiographic disease were analyzed.
  • Pelvic incidence (PI) and segmental lordosis (bone and disc) from L1 to sacrum were measured.
  • Correlative analysis and ANOVA were used to assess contributions.

Main Results:

  • Mean total bony lordosis was 10.8°, mean total disc lordosis was 36.3°.
  • Significant differences in bony lordosis were found across PI strata (P < .001).
  • Distal lordosis comprised 80.8% of total lordosis; proximal bone contribution was greater with increasing PI.

Conclusions:

  • Vertebral body contribution to lordosis is greater in the proximal lumbar spine as PI increases.
  • Low PI can lead to reduced proximal vertebral body lordosis, sometimes resulting in kyphosis.
  • Segmental analysis of spinal alignment is recommended over global analysis for future research.