title: MR imaging of meniscal subluxation in the knee.
abstract: OBJECTIVE
  The aim of this study was to establish diagnostic criteria for meniscal subluxation, and to determine whether there was any connection between meniscal subluxation and other common meniscal and knee-joint abnormalities.
  
  
  METHODS
  The normal position of the meniscal body was assessed in 10 asymptomatic volunteers. MR signs of meniscal subluxation were evaluated retrospectively in 60 symptomatic patients with pain in the knee, impaired mobility, and/or joint swelling who had no clear diagnosis after the evaluation of case history, clinical examination, and radiography. The criterion for subluxation of the meniscus was defined as a distance of > or = 3 mm between the peripheral border of the meniscus and the edge of the tibial plateau.
  
  
  RESULTS
  In the volunteers, the mean distance from the medial meniscus to the edge of the tibial plateau was 0.07 mm, and that from the lateral meniscus was 0 mm. In 55 symptomatic patients without meniscal subluxation, the mean distance from the meniscus to the edge of the tibial plateau was 0.27 mm. Five patients (8%) had evidence of meniscal subluxation, 4 in the medial meniscus and one in the lateral meniscus. The most commonly associated knee abnormality was joint effusion in 5 knees and osteoarthritis in 2 knees.
  
  
  CONCLUSIONS
  Meniscal subluxation was not a rare finding with MR imaging in patients with painful knees. Meniscal subluxation was associated with other knee abnormalities such as joint effusion or osteoarthritis.
authors.affiliation: Department of Radiology, University of Vienna, Austria.
authors.forename: M J
authors.initials: MJ
authors.lastname: Breitenseher
authors.forename: S
authors.initials: S
authors.lastname: Trattnig
authors.forename: I
authors.initials: I
authors.lastname: Dobrocky
authors.forename: C
authors.initials: C
authors.lastname: Kukla
authors.forename: S
authors.initials: S
authors.lastname: Nehrer
authors.forename: E
authors.initials: E
authors.lastname: Steiner
authors.forename: H
authors.initials: H
authors.lastname: Imhof
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis*; D007718:Knee Injuries / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods; D008297:Male; D008592:Menisci, Tibial / Q000473:pathology*; D008875:Middle Aged; D012189:Retrospective Studies; D000070600:Tibial Meniscus Injuries