title: Chronic tibiofibular syndesmosis injury of ankle: evaluation with contrast-enhanced fat-suppressed 3D fast spoiled gradient-recalled acquisition in the steady state MR imaging.
abstract: OBJECTIVE
  To retrospectively determine the accuracy of coronal contrast material-enhanced fat-suppressed three-dimensional (3D) fast spoiled gradient-recalled acquisition in the steady state (SPGR) magnetic resonance (MR) imaging, as compared with that of routine transverse MR imaging, in the assessment of distal tibiofibular syndesmosis injury, with arthroscopy as the reference standard.
  
  
  METHODS
  The review board of the College of Medicine in Yonsei University approved this study; informed consent was waived. The study group comprised 45 patients (26 men, 19 women; mean age, 32.1 years; range, 18-58 years) with a chronic ankle injury who had undergone MR imaging and arthroscopic surgery. Three independent readers retrospectively reviewed the two sets of MR images (one set of gadolinium-enhanced 3D fast SPGR images and one set of routine T1-, T2-, and intermediate-weighted images). Scores from 1 to 5 in increasing order of the probability of injury were assigned to both sets. Arthroscopy was the reference standard. Syndesmotic recess height was measured on contrast-enhanced images. The two sets of images were compared for diagnostic performance with receiver operating characteristic (ROC) analysis. Dissection and histologic examination of six cadaveric ankles was performed to assess the syndesmotic area and ascertain the enhancing structure at MR imaging.
  
  
  RESULTS
  At arthroscopy, syndesmotic injury was found in 24 ankles but not in 21 ankles. Areas under the ROC curve were significantly higher for the contrast-enhanced images (P<.05). The contrast-enhanced set showed higher accuracy, sensitivity, and specificity compared with the routine set for the assessment of syndesmosis injury. Mean syndesmotic recess height was significantly greater (P<.05) in patients with syndesmotic injury. Dissection and histologic examination revealed a highly vascular synovial fold in the syndesmotic area that is expected to enhance at MR imaging.
  
  
  CONCLUSIONS
  In the assessment of chronic syndesmosis injury, coronal gadolinium-enhanced fat-suppressed 3D fast SPGR MR images were more sensitive, specific, and accurate than routine MR images.
authors.affiliation: Department of Diagnostic Radiology, the Research Institute of Radiological Science of Severance Hospital, and the Brain Korea 21 Project for Medical Science, Yonsei University, College of Medicine, 134 Shinchondong, Seodaemun-ku, Seoul 120-752, Korea.
authors.forename: Sungjun
authors.initials: S
authors.lastname: Kim
authors.forename: Yong-Min
authors.initials: YM
authors.lastname: Huh
authors.forename: Ho-Taek
authors.initials: HT
authors.lastname: Song
authors.forename: Sung-Ah
authors.initials: SA
authors.lastname: Lee
authors.forename: Jin-Woo
authors.initials: JW
authors.lastname: Lee
authors.forename: Jong Eun
authors.initials: JE
authors.lastname: Lee
authors.forename: In Hyuk
authors.initials: IH
authors.lastname: Chung
authors.forename: Jin-Suck
authors.initials: JS
authors.lastname: Suh
mesh_terms: D000273:Adipose Tissue / Q000473:pathology; D000293:Adolescent; D000328:Adult; D000465:Algorithms; D016512:Ankle Injuries / Q000175:diagnosis*; D001182:Arthroscopy; D002908:Chronic Disease; D003287:Contrast Media; D005260:Female; D005682:Gadolinium; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D017844:Lateral Ligament, Ankle / Q000293:injuries* / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013180:Sprains and Strains / Q000175:diagnosis*
chemical_list: D003287:Contrast Media; D005682:Gadolinium