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Brinjikji et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations

One-paragraph summary

The authors synthesized 33 English-language CT/MRI studies containing 3,110 asymptomatic people and modeled prevalence by decade from age 20 to 80. Estimated disc degeneration rose from 37% at age 20 to 96% at age 80; bulge from 30% to 84%; protrusion from 29% to 43%; and annular fissure from 19% to 29% (PMID 25430861). The study does not show that all degeneration is harmless; it quantifies the high age-dependent base rate against which individual imaging must be interpreted.

Key findings

  • 33 studies and 3,110 asymptomatic individuals.
  • Disc degeneration: 37% at 20; 96% at 80.
  • Disc bulge: 30% at 20; 84% at 80.
  • Disc protrusion: 29% at 20; 43% at 80.
  • Annular fissure: 19% at 20; 29% at 80.
  • Generalized linear mixed-effects modeling accounted for clustering by study.

Limitations

  • Heterogeneous imaging techniques and feature definitions.
  • English-language published studies through April 2014.
  • “Asymptomatic” definitions and recruitment varied.
  • Decade estimates are modeled cross-sectional prevalence, not longitudinal trajectories.
  • The study estimates specificity constraints; it does not estimate individual causality.

Why it matters

This paper is the quantitative safeguard against equating a degenerative MRI with a pain diagnosis. It changed how radiology findings are communicated and how DDD cohorts should be interpreted.

Cited by wiki pages

  • Overview
  • Nomenclature and diagnostic validity
  • Epidemiology and natural history
  • Imaging and grading
  • Discogenic pain and differential
  • Biomarkers