title: Magnetic resonance imaging of hindfoot involvement in patients with spondyloarthritides: comparison of low-field and high-field strength units.
abstract: OBJECTIVE
  To compare MRI evaluation of a painful hindfoot of patients with spondyloarthritides (SpA) on low-field (0.2 T) versus high-field (1.5 T) MRI.
  
  
  METHODS
  Patients with SpA and hindfoot pain were randomly referred to either high-field or low-field MRI. Twenty-seven patients were evaluated (male/female: 17:10; mean age: 39+/-1.4 years). Fifteen patients were examined by low-field and 12 by high-field MRI. Two patients (evaluated by high-field MRI) were excluded. Images were separately read by two radiologists who later reached a consensus. In each patient the prevalence of erosions, fluid, synovitis or bone marrow edema of the hindfoot joints, tendinosis or tenosynovitis of tendons, enthesitis of the plantar fascia and Achilles tendon and retrocalcaneal bursitis were recorded. Clinical and demographic parameters were comparable between both groups.
  
  
  RESULTS
  MRI evaluation of joints and tendons of the hindfoot revealed no significant differences in patients with SpA groups for all parameters. Analyzing all joints or tendons together, there was no statistically significant difference between the two groups.
  
  
  CONCLUSIONS
  Low-field and high-field MRI provide comparable information for evaluation of inflammatory hindfoot involvement. Thus, low-field MRI can be considered as a reliable diagnostic tool for the detection of hindfoot abnormalities in SpA patients.
authors.affiliation: Department of Radiology, Charité Medical School, and Helios Clinics, 2nd Children's Hospital Berlin-Buch, Rheumatology Unit, Berlin, Germany.
authors.forename: Iris
authors.initials: I
authors.lastname: Eshed
authors.forename: Christian E
authors.initials: CE
authors.lastname: Althoff
authors.forename: Eugen
authors.initials: E
authors.lastname: Feist
authors.forename: Kirsten
authors.initials: K
authors.lastname: Minden
authors.forename: Tania
authors.initials: T
authors.lastname: Schink
authors.forename: Bernd
authors.initials: B
authors.lastname: Hamm
authors.forename: Kay-Geert A
authors.initials: KG
authors.lastname: Hermann
mesh_terms: D000328:Adult; D003287:Contrast Media; D005163:Factor Analysis, Statistical; D005260:Female; D005534:Foot Diseases / Q000473:pathology*; D019786:Gadolinium DTPA; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D025241:Spondylarthritis / Q000473:pathology*
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA