title: Reliability and diagnostic validity of a joint vibration analysis device.
abstract: BACKGROUND
  This observational study was designed to evaluate the reliability and diagnostic validity of Joint Vibration Analysis (JVA) in subjects with bilateral disc displacement with reduction and in subjects with bilateral normal disc position.
  
  
  METHODS
  The reliability of selecting the traces was assessed by reading the same traces at an interval of 30 days. The reliability of the vibrations provided by the subjects was assessed by obtaining two tracings from each individual at an interval of 30 min. The validity compared the Joint Vibration Analysis parameters against magnetic resonance imaging as the reference standard. The data were analyzed with exploratory factor analysis.
  
  
  RESULTS
  The short- term reliability of the Joint Vibration Analysis outcome variables showed excellent results. Implementing factor analysis and a receiver operating characteristic as analytical methods showed that six items of the Joint Vibration Analysis outcome variables could be scaled and normalized to a composite score which presented acceptable levels of sensitivity and specificity with a receiver operating characteristic of 0.8.
  
  
  CONCLUSIONS
  This study demonstrated that the composite score generated from the Joint Vibration Analysis variables could discriminate between subjects with bilateral normal versus bilateral displaced discs.
authors.affiliation: Department of Oral Diagnostic Sciences, School of Dental Medicine, University at Buffalo, Buffalo, NY, 14214, USA.
authors.forename: Sonia
authors.initials: S
authors.lastname: Sharma
authors.affiliation: Department of Oral Diagnostic Sciences, School of Dental Medicine, University at Buffalo, Buffalo, NY, 14214, USA.
authors.forename: Heidi C
authors.initials: HC
authors.lastname: Crow
authors.affiliation: Department of Oral Diagnostic Sciences, School of Dental Medicine, University at Buffalo, Buffalo, NY, 14214, USA.
authors.forename: Krishnan
authors.initials: K
authors.lastname: Kartha
authors.affiliation: Department of Oral Diagnostic Sciences, School of Dental Medicine, University at Buffalo, Buffalo, NY, 14214, USA. wdmccall@buffalo.edu.
authors.forename: W D
authors.initials: WD
authors.lastname: McCall
authors.affiliation: Department of Oral Diagnostic Sciences, School of Dental Medicine, University at Buffalo, Buffalo, NY, 14214, USA.
authors.forename: Yoly M
authors.initials: YM
authors.lastname: Gonzalez
mesh_terms: D061725:Accelerometry; D000328:Adult; D003937:Diagnosis, Differential; D004867:Equipment Design; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D008297:Male; D015203:Reproducibility of Results; D012984:Software; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis*; D014732:Vibration
keywords: Diagnostic validity; Factor analysis; Joint vibration; Reliability; Temporomandibular disorders