title: Magnetic resonance imaging findings of internal derangement, osteoarthrosis, effusion, and bone marrow edema before and after performance of arthrocentesis and hydraulic distension of the temporomandibular joint.
abstract: OBJECTIVE
  To investigate whether temporomandibular joint (TMJ) internal derangement type III and capsulitis/synovitis are related to magnetic resonance imaging (MRI) diagnoses of internal derangement, osteoarthrosis (OA), effusion, and/or bone marrow edema (BME), and whether arthrocentesis is associated with changes in diagnoses of internal derangement, OA, effusion, and/or BME.
  
  
  METHODS
  The study comprised 28 patients with a clinical unilateral TMJ disorder of internal derangement type III and capsulitis/synovitis. Bilateral MRI was immediately performed preoperatively and at a 2-month follow-up.
  
  
  RESULTS
  There was a significant relationship between TMJ internal derangement type III and capsulitis/synovitis and TMJ internal derangement (P = .000), effusion (P = .036), and BME (P = .002). MRI showed a significant decrease in diagnoses of TMJ BME ((P = .018).
  
  
  CONCLUSIONS
  MRI variables of internal derangement, effusion, and BME were related to TMJ internal derangement type III and capsulitis/synovitis; however, arthrocentesis was only associated with a significant change in diagnoses of TMJ BME.
authors.affiliation: Department of Oral and Maxillo-Facial Surgery, University Clinic of Innsbruck, Innsbruck, Austria. Ruediger_Emshoff@hotmail.com
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Emshoff
authors.forename: Stefan
authors.initials: S
authors.lastname: Gerhard
authors.forename: Thomas
authors.initials: T
authors.lastname: Ennemoser
authors.forename: Ansgar
authors.initials: A
authors.lastname: Rudisch
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001855:Bone Marrow Diseases / Q000175:diagnosis; D016009:Chi-Square Distribution; D004311:Double-Blind Method; D004487:Edema / Q000175:diagnosis; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis* / Q000628:therapy; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000175:diagnosis; D019152:Paracentesis; D013582:Synovial Fluid; D013585:Synovitis / Q000175:diagnosis* / Q000628:therapy; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000628:therapy; D007507:Therapeutic Irrigation