title: Imaging of bone micro-injuries.
abstract: OBJECTIVE
  We evaluated the fundamental signs of each imaging modality to define the role of MRI in identifying and characterizing bone micro-injuries.
  
  
  METHODS
  We retrospectively reviewed 50 MRI examinations performed after preliminary conventional radiography on 25 stress fractures and 25 insufficiency fractures between 1989 and 2002. The number of lesions identified was 55: 11 were evaluated with CT and 9 with radionuclide bone scan.
  
  
  RESULTS
  Although bone micro-injuries have different pathogenetic mechanisms, the final outcome is a cortical and/or spongy bone fissure, followed by repair processes. Conventional x-ray showed the presence of a lesion in 24/55 cases. Radionuclide bone scanning allowed suspicion or confirmation of the lesion in 8/9 cases. MR identified the lesion in all cases. CT allowed recognition of the lesion in 10/11 cases.
  
  
  CONCLUSIONS
  When a bone micro-injury is suspected following conventional radiography, MRI is the most sensitive and specific modality able to complete the diagnostic work-up.
authors.affiliation: Dipartimento di Diagnostica per Immagini, Ospedale Carlo Poma, Mantova, Italy.
authors.forename: Vittorio
authors.initials: V
authors.lastname: Boniotti
authors.forename: Eleanora
authors.initials: E
authors.lastname: Del Giudice
authors.forename: Elena
authors.initials: E
authors.lastname: Fengoni
authors.forename: Roberto
authors.initials: R
authors.lastname: Cerini
authors.forename: Roberto
authors.initials: R
authors.lastname: Caudana
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001265:Athletic Injuries / Q000175:diagnosis / Q000000981:diagnostic imaging; D005260:Female; D005598:Fractures, Spontaneous / Q000175:diagnosis* / Q000000981:diagnostic imaging; D015775:Fractures, Stress / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D007869:Leg Injuries / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed