title: Extremity-dedicated low-field MRI shows good diagnostic accuracy and interobserver agreement for the diagnosis of the acutely injured knee.
abstract: OBJECTIVE
  To estimate diagnostic accuracy and interobserver agreement of extremity-dedicated low-field magnetic resonance imaging (lfMRI) for meniscal tears, anterior cruciate ligament (ACL) tears and knee fractures.
  
  
  METHODS
  We enrolled 62 patients with acute knee trauma and 19 patients with suspected knee fracture. Arthroscopy/Computed tomography was regarded the gold standard for cruciate ligament and meniscal tears/fractures.
  
  
  RESULTS
  Arthroscopy showed 39 meniscal tears. Sensitivity/Specificity of lfMRI was 95.8%/97.4% (reader 1)/100%/100% (reader 2) for medial and 93.3%/100% (reader 1)/93.3%/93.6% (reader 2) for lateral meniscal tears. Sensitivity/Specificity was 100% for ACL tears and fractures. Interobserver agreement was very good.
  
  
  CONCLUSIONS
  lfMRI showed reproducible high sensitivity and specificity for the diagnosis of the acutely injured knee.
authors.affiliation: Department of Radiology, University Hospital Freiburg, Freiburg, Germany.
authors.forename: Jonas
authors.initials: J
authors.lastname: Bürk
authors.affiliation: Fraunhofer Institute for Medical Image Computing MEVIS, Bremen, Germany.
authors.forename: Marco
authors.initials: M
authors.lastname: Vicari
authors.affiliation: Department of Radiology, University Hospital Freiburg, Freiburg, Germany.
authors.forename: Philippe
authors.initials: P
authors.lastname: Dovi-Akué
authors.affiliation: Department of Radiology, University Hospital Freiburg, Freiburg, Germany. Electronic address: matthias.benndorf@uniklinik-freiburg.de.
authors.forename: Matthias
authors.initials: M
authors.lastname: Benndorf
authors.affiliation: Department of Radiology, University Hospital Freiburg, Freiburg, Germany.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Fritz
authors.affiliation: Department of Radiology, University Hospital Freiburg, Freiburg, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Lenz
authors.affiliation: Department of Traumatology, University Hospital Freiburg, Freiburg, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Niemeyer
authors.affiliation: Division of Nuclear Medicine, University of Basel Hospital, Basel, Switzerland.
authors.forename: Tobias
authors.initials: T
authors.lastname: Baumann
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D000070598:Anterior Cruciate Ligament Injuries; D001182:Arthroscopy; D002648:Child; D005260:Female; D050723:Fractures, Bone / Q000175:diagnosis*; D006801:Humans; D007718:Knee Injuries / Q000175:diagnosis*; D007719:Knee Joint / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D000070600:Tibial Meniscus Injuries; D014057:Tomography, X-Ray Computed; D055815:Young Adult
keywords: Cruciate ligament tear; Extremity; Low-field MRI; Meniscal tear