title: Magnetic resonance characteristics of temporomandibular joint disc displacement in elderly patients.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the MR characteristics of temporomandibular joint (TMJ) disc displacement in elderly patients.
  
  
  METHODS
  Of the MR images of 1660 TMJs in 847 patients with disc displacement who underwent MRI for suspected temporomandibular disorders, 301 TMJs in 154 patients aged over 50 years were studied as an elderly group. These MR images of the elderly group were compared with those of a control group (1359 TMJs in 693 patients aged under 51 years) concerning disc displacement with or without reduction, joint effusion and osteoarthrosis.
  
  
  RESULTS
  The incidence of disc displacement with osteoarthrosis was significantly different between the elderly (41.9%) and the control (19.8%) groups (p = 0.000). Logistic multivariate regression analysis demonstrated that the osteoarthrosis was a significant variable (odds ratio  =  2.94, p = 0.000).
  
  
  CONCLUSIONS
  This study suggests that MR characteristics of TMJ disc displacement in elderly patients includes osteoarthrosis.
authors: Department of Radiology, Nihon University School of Dentistry at Matsudo, Chiba, Japan. ogura.ichirou@nihon-u.ac.jp
authors: I
authors: I
authors: Ogura
authors: T
authors: T
authors: Kaneda
authors: S
authors: S
authors: Mori
authors: M
authors: M
authors: Sakayanagi
authors: M
authors: M
authors: Kato
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D006801:Humans; D004204:Joint Dislocations / Q000473:pathology; D016015:Logistic Models; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D010003:Osteoarthritis / Q000473:pathology; D013704:Temporomandibular Joint / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000473:pathology*