title: Use of MR arthrography in detecting tears of the ligamentum teres with arthroscopic correlation.
abstract: OBJECTIVE
  To demonstrate the normal appearance of the ligamentum teres on MR arthrography (MRA) and evaluate the accuracy of MRA in detecting ligamentum teres tears with arthroscopic correlation.
  
  
  METHODS
  Institutional Review Board approval was obtained with a waiver for informed consent because of the retrospective study design. A total of 165 cases in 159 patients (111 females, 48 males; mean age 41 ± 12 years) who underwent both MRA and hip arthroscopy were evaluated for appearance of the ligamentum teres, including the size, number of bundles, and ligamentum teres tears. Marrow edema of the fovea capitis adjacent to the ligamentum teres insertion and the presence of hip plicae were also recorded.
  
  
  RESULTS
  The mean thickness and length of the ligamentum teres were 3.5 ± 1.5 mm and 25.2 ± 3.8 mm, respectively. Sensitivity, specificity, positive and negative predictive value, and accuracy of MRA for the detection of ligamentum teres tears were 78, 97, 74, 97, and 95%, respectively.
  
  
  CONCLUSIONS
  MRA is an accurate method to evaluate the normal morphology and to detect tears of the ligamentum teres.
authors.affiliation: Division of Musculoskeletal Imaging and Intervention, Department of Radiology, Massachusetts General Hospital, Yawkey 6E, 55 Fruit Street, Boston, MA, 02114, USA, cychang@mgh.harvard.edu.
authors.forename: Connie Y
authors.initials: CY
authors.lastname: Chang
authors.forename: Corey M
authors.initials: CM
authors.lastname: Gill
authors.forename: Ambrose J
authors.initials: AJ
authors.lastname: Huang
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Simeone
authors.forename: Martin
authors.initials: M
authors.lastname: Torriani
authors.forename: Joseph C
authors.initials: JC
authors.lastname: McCarthy
authors.forename: Miriam A
authors.initials: MA
authors.lastname: Bredella
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001175:Arthrography / Q000379:methods*; D001182:Arthroscopy / Q000379:methods*; D005260:Female; D025981:Hip Injuries / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D015203:Reproducibility of Results; D000069593:Round Ligament of Femur / Q000293:injuries* / Q000473:pathology*; D012421:Rupture / Q000473:pathology; D012680:Sensitivity and Specificity; D055815:Young Adult