title: An epidemiologic study of MRI and low back pain in 13-year-old children.
abstract: METHODS
  Cross-sectional cohort study of a general population.
  
  
  OBJECTIVE
  To describe associations between "abnormal" lumbar magnetic resonance imaging (MRI) findings and low back pain (LBP) in 13-year old children.
  
  
  BACKGROUND
  Very little is known about the distribution of lumbar MRI findings and how they are associated with LBP in youngsters.
  
  
  METHODS
  Disc abnormalities, as well as nerve root compromise, endplate changes, and anterolisthesis were identified from MRI studies of 439 children. LBP was identified from structured interviews. Associations are presented as odds ratios (OR).
  
  
  RESULTS
  Signs of disc degeneration were noted in approximately 1/3 of the subjects. Reduced signal intensity and irregular nucleus shape in the upper 3 lumbar discs were significantly associated with LBP within the last month (OR, 2.5-3.6), whereas reduced signal intensity and disc protrusion at L5-NS1 were associated with seeking care (OR, 2.8 and 7.7, respectively). Endplate changes in relation to the L3 discs were associated with LBP month and seeking care (OR, between 9.7 and 22.2). Anterolisthesis at L5 was associated with seeking care (OR, 4.3). There were obvious differences between genders: degenerative disc changes in the upper lumbar spine were more strongly associated with LBP in boys, while disc abnormalities in the lower lumbar spine were more strongly associated with seeking care in girls.
  
  
  CONCLUSIONS
  In children, degenerative disc findings are relatively common, and some are associated with LBP. There appears to be a gender difference. Disc protrusions, endplate changes, and anterolisthesis in the lumbar spine were strongly associated with seeking care for LBP.
authors.affiliation: The Back Research Center, Backcenter Funen and University of Southern Denmark, Lindevej, Denmark. pkrj@shf.fyns-amt.dk
authors.forename: Per
authors.initials: P
authors.lastname: Kjaer
authors.forename: Charlotte
authors.initials: C
authors.lastname: Leboeuf-Yde
authors.forename: Joan Solgaard
authors.initials: JS
authors.lastname: Sorensen
authors.forename: Tom
authors.initials: T
authors.lastname: Bendix
mesh_terms: D000293:Adolescent; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D003718:Denmark / Q000453:epidemiology; D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000175:diagnosis* / Q000453:epidemiology* / Q000523:psychology; D008159:Lumbar Vertebrae / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D010342:Patient Acceptance of Health Care; D015995:Prevalence; D012720:Severity of Illness Index; D017678:Sex Distribution