title: MRI and clinical findings of posterior disk displacement in the temporomandibular joint.
abstract: OBJECTIVE
  The objective of this study was to evaluate the magnetic resonance imaging and clinical findings of patients with posterior disk displacement in the temporomandibular joint.
  
  
  METHODS
  Magnetic resonance and clinical findings of 62 temporomandibular joints (44 patients) with posterior disk displacement were retrospectively analyzed.
  
  
  RESULTS
  According to the criteria proposed by Westesson et al., 52 temporomandibular joints (84%) were the thin flat disk type and the remaining 10 (16%) were the perforated disk type. Fifteen temporomandibular joints (24%) had a history of luxation. Clicking was observed in 26 temporomandibular joints (42%), all of which were the thin flat disk type (chi-square test, P < .01). Pain was observed in 19% of patients with the thin flat disk type and 60% of those with the perforated disk type (P < .05).
  
  
  CONCLUSIONS
  Magnetic resonance imaging could clearly reveal the details of posterior disk displacement in the temporomandibular joint. The clinical findings were dissimilar between the thin flat and the perforated disk type.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. kiyoshi.orad@tmd.ac.jp
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Okochi
authors.forename: Mizue
authors.initials: M
authors.lastname: Ida
authors.forename: Eiichi
authors.initials: E
authors.lastname: Honda
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Tohru
authors.initials: T
authors.lastname: Kurabayashi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005157:Facial Pain; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D013016:Sound; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000473:pathology*