title: Correlation between temporomandibular joint morphology and disc displacement by MRI.
abstract: OBJECTIVE
  The aim was to evaluate the morphology of the temporomandibular joint's (TMJs) disc and condyle as well as its correlation with disc displacement, using MRI.
  
  
  METHODS
  190 TMJs were retrospectively analysed. The condyle morphology of each TMJ was evaluated by two observers using both axial and coronal views, as were their disc morphology and displacement, using sagittal view. Condyle morphology was classified as flat, convex, angled or rounded in the coronal sections and as anterior side flat/posterior side convex, biconvex, anterior side concave/posterior side convex, flat or biconcave in the axial view. Disc morphology was determined as biconcave, biplanar, biconvex, hemiconvex or folded. χ2, Fisher exact and Bonferroni correction tests were used to evaluate the data. ANOVA followed by post hoc Tukey's test was used to evaluate the interaction between age and disc displacement.
  
  
  RESULTS
  Anterior disc displacement with reduction; convex condyle morphology in the coronal view; anterior side concave/posterior side convex morphology in the axial view; and biconcave discs were found to be the most prevalent findings. An association was observed between disc morphology and disc displacement (p<0.001). No correlation between condyle morphology and TMJ disc displacement was found (p=0.291 for axial and p=0.14 for coronal views).
  
  
  CONCLUSIONS
  The results of this study suggest that TMJ disc morphology is associated with disc displacement.
authors: 1 Division of Oral Radiology, Department of Oral Diagnosis, State University of Paraíba, Campina Grande, Paraíba, Brazil.
authors: J F G
authors: JF
authors: de Farias
authors: 2 Department of Oral Pathology, Radiology & Medicine, University of Iowa College of Dentistry, Iowa, IA, USA.
authors: S L S
authors: SL
authors: Melo
authors: 1 Division of Oral Radiology, Department of Oral Diagnosis, State University of Paraíba, Campina Grande, Paraíba, Brazil.
authors: P M
authors: PM
authors: Bento
authors: 3 Department of Health Technology and Biology, Division of Radiology, Federal Institute of Bahia, Salvador, Brazil.
authors: L S A F
authors: LS
authors: Oliveira
authors: 4 Division of Oral Radiology, Department of Oral Diagnosis, Federal University of Bahia, Salvador, Brazil.
authors: P S F
authors: PS
authors: Campos
authors: 1 Division of Oral Radiology, Department of Oral Diagnosis, State University of Paraíba, Campina Grande, Paraíba, Brazil.
authors: D P
authors: DP
authors: de Melo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000473:pathology*
keywords: magnetic resonance imaging; temporomandibular joint disc; temporomandibular joint disorders