title: Acetabular labrum: MRI in asymptomatic volunteers.
abstract: OBJECTIVE
  The purpose of this study was to describe the MR appearance of the acetabular labrum in asymptomatic hips on high resolution MRI.
  
  
  METHODS
  Fifty-two hips in 46 asymptomatic volunteers with an age range of 15-85 years were evaluated with coronal and axial T1-weighted and T2-weighted sequences. The shape, margin, size, and signal intensity of the acetabular labrum were analyzed.
  
  
  RESULTS
  The labrum was absent in its anterosuperior aspect in five hips (10%). Intralabral regions of intermediate of high signal intensity were detected in 30 hips (58%) imaged with T1-weighted and proton density-weighted sequences. Intralabral linear hyperintense foci reaching the articular surface and consistent with a labral tear were detected in four labra on T2-weighted images. Intralabral microcysts were seen in three labra.
  
  
  CONCLUSIONS
  The MR appearance of the hip labrum is varied in asymptomatic volunteers. Intralabral increased signal intensity and absent anterosuperior labra are especially frequent and may represent asymptomatic lesions or normal variations.
authors.affiliation: Service de Radiologie Ostéo-Articulaire, Hôpital Roger Salengro, CHRU de Lille, France.
authors.forename: A
authors.initials: A
authors.lastname: Cotten
authors.forename: N
authors.initials: N
authors.lastname: Boutry
authors.forename: X
authors.initials: X
authors.lastname: Demondion
authors.forename: C
authors.initials: C
authors.lastname: Paret
authors.forename: F
authors.initials: F
authors.lastname: Dewatre
authors.forename: A
authors.initials: A
authors.lastname: Liesse
authors.forename: P
authors.initials: P
authors.lastname: Chastanet
authors.forename: C
authors.initials: C
authors.lastname: Fontaine
mesh_terms: D000077:Acetabulum / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002358:Cartilage, Articular / Q000033:anatomy & histology; D005260:Female; D006621:Hip Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012016:Reference Values; D013581:Synovial Cyst / Q000175:diagnosis