title: [The study on relativity of the time of traumatic diskal hernia and the change of CT rate].
abstract: OBJECTIVE
  To find out the relativity between the time when the traumatic prolapse of intervertebral disc occurred and the change of the CT numerical value.
  
  
  METHODS
  The CT numerical value of the vertebral pulp of herniation (denoted as A) and the CT numerical value of the vertebral pulp without herniation (denoted as B) were measured in for 198 patients and analyzed the relation between this parameter and the time when the prolapse of intervertebral disc occurred.
  
  
  RESULTS
  It's found find out that there is relativity between the parameter and the time when the prolapse of intervertebral disc occurred, and this difference has the value for the statistics, when the parameter is at about -12 to -40 HU, the average value is -25.8 HU (A < B), it can be determined the prolapse of intervertebral disc occurred within 3 months ago. When the parameter is at about -13 to 0 HU, the average value is -6.6HU (A is similar with B), it can be determined the prolapse of intervertebral disc occurred at about 4-6 months ago. When the parameter is at about 37 to 289HU, the average value is 96.1 HU (A > B). It can be determined the prolapse of intervertebral disc occurred more than 12 months ago.
  
  
  CONCLUSIONS
  The approximate time can be determined when the prolapse of interverterbral disc occurred by the paremeter.
authors.affiliation: Zibo Middle People's Court, Zibo 255037, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Da-Huang
authors.initials: DH
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006547:Hernia / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging* / Q000293:injuries / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D036542:Tomography, Spiral Computed; D055815:Young Adult