title: Comparative study of postoperative and spontaneous pyogenic spondylodiscitis.
abstract: OBJECTIVE
  Postoperative spondylodiscitis (POS) is poorly characterized, partly owing to its rarity. The aim of this prospective study was to compare the clinical, biological, bacteriological, and imaging features of postoperative and spontaneous spondylodiscitis (SS).
  
  
  METHODS
  A multidisciplinary spondylodiscitis cohort follow-up study was conducted between February 1999 and June 2003 in a 500-bed teaching hospital. All patients hospitalized in internal medicine, orthopedic, and neurosurgery wards with a culture-proven diagnosis of pyogenic spondylodiscitis were included. Clinical and bacteriological data were collected. All patients underwent computed tomography and/or magnetic resonance imaging of the spine.
  
  
  RESULTS
  Sixteen patients had SS and 7 patients had POS. Patients with POS tended to be younger (52 versus 69 years), with less frequent underlying diseases (29 versus 75%) and a more prolonged interval between symptom onset and diagnosis (16 versus 3.4 weeks) than patients with SS. Blood cultures were positive in 14 and 81% of cases in the POS and SS groups, respectively, and invasive diagnostic procedures were necessary in 86% of patients with POS and 19% of patients with SS ( P = 0.005). Staphylococci were the more frequent isolates in both groups but were more frequently coagulase-negative in POS patients than in patients with SS ( P = 0.01). Vertebral edema tended to be more frequent in POS and was located more posteriorly than in SS ( P = 0.023).
  
  
  CONCLUSIONS
  POS is associated with specific clinical, microbiological, and imaging features possibly related to pathophysiologic characteristics. Knowledge of these characteristics should help reduce the current delay in the diagnosis of POS.
authors.affiliation: Hôpital Beaujon, Clichy, Assistance Publique-Hôpitaux de Paris, France.
authors.forename: Véronique
authors.initials: V
authors.lastname: Dufour
authors.forename: Antoine
authors.initials: A
authors.lastname: Feydy
authors.forename: Ludovic
authors.initials: L
authors.lastname: Rillardon
authors.forename: Aimée
authors.initials: A
authors.lastname: Redondo
authors.forename: Laurence
authors.initials: L
authors.lastname: Le Page
authors.forename: Frédéric
authors.initials: F
authors.lastname: Bert
authors.forename: Nadia
authors.initials: N
authors.lastname: Belmatoug
authors.forename: Bruno
authors.initials: B
authors.lastname: Fantin
mesh_terms: D000328:Adult; D000368:Aged; D015331:Cohort Studies; D003952:Diagnostic Imaging / Q000379:methods*; D015299:Discitis / Q000175:diagnosis* / Q000453:epidemiology / Q000209:etiology; D005260:Female; D006784:Hospitals, Teaching; D006801:Humans; D015994:Incidence; D007796:Laminectomy / Q000009:adverse effects / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis* / Q000188:drug therapy; D011336:Probability; D011379:Prognosis; D011446:Prospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D013122:Spinal Diseases / Q000601:surgery; D013123:Spinal Fusion / Q000009:adverse effects / Q000379:methods; D013203:Staphylococcal Infections / Q000175:diagnosis* / Q000453:epidemiology; D013211:Staphylococcus aureus / Q000302:isolation & purification; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed / Q000379:methods