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Morphologic Changes of the Intervertebral Disk During Growth.

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This study details how intervertebral discs (IVDs) in children mature, showing changes in shape and size from birth to age 18. These findings provide a baseline for understanding pediatric spinal conditions.

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Area of Science:

  • Pediatric imaging and anatomy
  • Spinal development and biomechanics
  • Intervertebral disc morphology

Background:

  • Limited understanding of intervertebral disc (IVD) maturation during childhood growth.
  • Potential role of IVD development in pediatric spinal deformities.
  • Need for data on annulus fibrosus (AF) and nucleus pulposus (NP) proportions and orientation changes.

Purpose of the Study:

  • To describe the morphologic development of the annulus fibrosus (AF) and nucleus pulposus (NP) in children aged 0-18.
  • To establish normative data for IVD dimensions and proportions during growth.
  • To provide a reference for pediatric spinal conditions.

Main Methods:

  • Cross-sectional analysis of magnetic resonance imaging (MRI) data from 0-18 year olds.
  • Semi-automatic segmentation of AF and NP from T1 to L5.
  • Extraction and comparison of IVD height, cross-sectional area, slenderness, volume, and NP centroid position by age, sex, and spinal level.

Main Results:

  • IVD height increased modestly in the lower thoracic and lumbar spine; volume increased steadily throughout growth.
  • IVD slenderness decreased sharply in early childhood, with females showing smaller, more slender discs.
  • Nucleus pulposus (NP) proportion increased from 10-12% in the upper/mid-thoracic spine to 20-25% in the lower thoracic/lumbar spine.

Conclusions:

  • This study provides a comprehensive description of thoracic and lumbar IVD development in children.
  • The findings serve as a normative reference for pediatric spinal development.
  • This data can inform future research on the etiology of IVD-related pediatric disorders.