title: [Evaluation of anterior knee laxity on MRI].
abstract: OBJECTIVE
  Evaluation of the ACL and anterior knee laxity on MR during anterior tibial translation.
  
  
  METHODS
  Three groups were identified based on clinical and arthrometric (KT-1000) data: normal ACL (n=12), complete tear (n=10) and partial tear (n=20). MRI was performed without and with anterior tibial translation (pneumatic device) with morphological and laximetric analysis: drawer tests and dynamic evaluation of ligamentous tension.
  
  
  RESULTS
  Intra- and inter-observer reproducibility was excellent, correlated to arthrometric data and clinical tests (Lachman, pivot shift). The difference between the drawer signs of normal subjects and patients with ACL tear was significant for a threshold value of 1,1mm for the anterior drawer (sensitivity: 93.33%, specificity: 91.7%) and 2.8 mm for the posterior drawer (sensitivity: 86.7%, specificity: 100%). Dynamic evaluation of ligamentous tension was also reproducible, statistically correlated to the MR drawer tests and reliable for the diagnosis of ACL lesions. In this preliminary study, the distinction between complete and partial ACL tears could not be detected.
  
  
  CONCLUSIONS
  Anterior cruciate ligament function can be demonstrated on MR. The predictive value of this morphological and functional association should be determined in the management of patients with partial tears.
authors.affiliation: Service de radiologie, centre hospitalier Lyon-Sud, 165, chemin du Grand-Revoyet, 69310 Pierre-Bénite, France. maxtar2@gmail.com
authors.forename: M
authors.initials: M
authors.lastname: Tardieu
authors.forename: J-F
authors.initials: JF
authors.lastname: Luciani
authors.forename: B
authors.initials: B
authors.lastname: Bordet
authors.forename: M-A
authors.initials: MA
authors.lastname: Le Pogam
authors.forename: D
authors.initials: D
authors.lastname: Dejour
authors.forename: J-B
authors.initials: JB
authors.lastname: Pialat
mesh_terms: D000328:Adult; D016118:Anterior Cruciate Ligament / Q000473:pathology; D000070598:Anterior Cruciate Ligament Injuries; D053587:Arthrometry, Articular / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007593:Joint Instability / Q000175:diagnosis*; D007718:Knee Injuries / Q000175:diagnosis; D007719:Knee Joint / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D012016:Reference Values; D015203:Reproducibility of Results; D012421:Rupture; D055815:Young Adult