title: [Disc alterations of lumbar spine on magnetic resonance images in asymptomatic workers].
abstract: OBJECTIVE
  to determine abnormal findings of the lumbar spine on magnetic resonance images in asymptomatic subjects.
  
  
  METHODS
  prospective, transverse and descriptive study, in workers of the Instituto Mexicano del Seguro Social without low back pain; they were invited to be observed with magnetic resonance images of lumbar spine. A total of 105 cases was interpreted by a radiologist, who did not know the patients' clinical conditions. 107 lumbar spine alterations studies were mixed in order to not influence in the results, and they were not included in the statistic analysis.
  
  
  RESULTS
  55 % of the cases had discal alterations, 38 % presented bulging disk and 17 % presented protrusion. Other alterations were Schmorl's nodule, osteocondrosis, espondilolistesis, and annular tears.
  
  
  CONCLUSIONS
  bulging disk and discal protrusion frequency have high prevalence in magnetic resonance images in healthy individuals, so its presence in symptomatic patients is not necessarily cause of low back pain.
authors.affiliation: Radiología e Imagen, Unidad Médica de Alta Especialidad, Hospital de Especialidades 14, Centro Médico Nacional "Adolfo Ruiz Cortines," Instituto Mexicano del Seguro Social, Veracruz, Veracruz, Mexico. quimoro@hotmail.com
authors.forename: Rocío
authors.initials: R
authors.lastname: Quiroz-Moreno
authors.forename: Gabriel
authors.initials: G
authors.lastname: Lezama-Suárez
authors.forename: Carlos
authors.initials: C
authors.lastname: Gómez-Jiménez
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000150:complications / Q000473:pathology*; D017116:Low Back Pain / Q000209:etiology; D008159:Lumbar Vertebrae / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012720:Severity of Illness Index; D055815:Young Adult