title: Diagnostic concordance between MRI and electrovibratography of the temporomandibular joint of subjects with disc displacement disorders.
abstract: OBJECTIVE
  The aim of this study is to evaluate the diagnostic concordance of MRI and electrovibratography (EVG) of the temporomandibular joint (TMJ) in the diagnosis of articular disc displacement with reduction (ADDwR) and articular disc displacement without reduction (ADDw/oR).
  
  
  METHODS
  50 patients (12 males, 38 females; mean age 37.46 ± 15.64 years) with a hypothesis of disc displacement were selected. For each patient an MRI of the TMJ was performed. MRIs were evaluated sorting the 100 TMJs by kind of pathology (no pathology, ADDwR, ADDw/oR, and joint hypermobility). Afterwards, the patients had an EVG exam. The EVG exams were performed with vibration transducers over each TMJ, enabling simultaneous, bilateral recording of vibrations emanating from joint sounds during the opening and closing movements. The presence of a sound peak was compared with the MRI diagnosis of ADDwR, while a multipeak aspect was compared with ADDw/oR diagnosis using Cohen's kappa test.
  
  
  RESULTS
  The presence of a peak-shaped track has high specificity for ADDwR (90.27%). The Cohen's kappa calculated for the ADDwR was 0.5615 (good-moderate). The presence of a multipeak-shaped track has low specificity (65.22%) and sensitivity (70.42%). The Cohen's kappa calculated for the ADDw/oR was 0.2992 (poor).
  
  
  CONCLUSIONS
  The present study recommends the use of EVG to support the clinical diagnosis of a disc displacement with reduction when MRI is not available or when subjects cannot be investigated by MRI.
authors: University of Turin, Dental School, Turin, Italy. andrea.deregibus@unito.it
authors: A
authors: A
authors: Deregibus
authors: T
authors: T
authors: Castroflorio
authors: I
authors: I
authors: De Giorgi
authors: C
authors: C
authors: Burzio
authors: C
authors: C
authors: Debernardi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004568:Electrodiagnosis / Q000295:instrumentation / Q000379:methods*; D005188:False Negative Reactions; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis*; D007593:Joint Instability / Q000175:diagnosis; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D016059:Range of Motion, Articular / Q000502:physiology; D012680:Sensitivity and Specificity; D013016:Sound; D013704:Temporomandibular Joint / Q000473:pathology; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis*; D014159:Transducers; D014732:Vibration; D055815:Young Adult