title: MRI of the sinus tarsi in acute ankle sprain injuries.
abstract: OBJECTIVE
  Our goal was to evaluate the visibility and incidence of traumatic abnormalities of the sinus tarsi in patients with acute ankle sprain injuries and compare these findings with the extent of lateral ankle ligament injuries on MRI.
  
  
  METHODS
  Sixty athletically active patients (aged 18-45 years) with recent inversion trauma (< or = 7 days) underwent MRI. Replacement of fat tissue in the sinus tarsi was recorded. Inter/intraobserver agreement was calculated (kappa-statistics). Injuries of the three lateral ligaments, evaluated by MRI, were graded according to partial (1 point) or complete (2 points) tears for each of three lateral ligaments (together 0-6 points) and were compared with sinus tarsi abnormalities.
  
  
  RESULTS
  In 26 patients (43%), replacement of sinus tarsi fat tissue was depicted by MRI. Inter/intraobserver agreement for MR changes of the sinus tarsi was good to moderate (kappa = 0.675/0.584). Grade of lateral ankle ligament injury showed a statistically significant difference (p = 0.033) between the two sinus tarsi groups (normal/abnormal).
  
  
  CONCLUSIONS
  Acute ankle sprain injuries, evaluated by MRI, are associated with acute abnormalities of the sinus tarsi in 43% of patients and correlate with the extent of lateral ankle ligament tears.
authors.affiliation: Department of Radiology, University of Vienna, Austria.
authors.forename: M J
authors.initials: MJ
authors.lastname: Breitenseher
authors.forename: J
authors.initials: J
authors.lastname: Haller
authors.forename: C
authors.initials: C
authors.lastname: Kukla
authors.forename: C
authors.initials: C
authors.lastname: Gaebler
authors.forename: A
authors.initials: A
authors.lastname: Kaider
authors.forename: D
authors.initials: D
authors.lastname: Fleischmann
authors.forename: T
authors.initials: T
authors.lastname: Helbich
authors.forename: S
authors.initials: S
authors.lastname: Trattnig
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D016512:Ankle Injuries / Q000175:diagnosis*; D000843:Ankle Joint / Q000473:pathology*; D005260:Female; D006801:Humans; D017844:Lateral Ligament, Ankle / Q000293:injuries / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011446:Prospective Studies; D013180:Sprains and Strains / Q000175:diagnosis*