title: Structural characteristics of bilateral temporomandibular joint disc displacement without reduction and osteoarthrosis are important determinants of horizontal mandibular and vertical ramus deficiency: a magnetic resonance imaging study.
abstract: OBJECTIVE
  To estimate in patients with temporomandibular joint (TMJ) arthralgia whether magnetic resonance (MR) imaging findings of bilateral TMJ disc displacement without reduction (DDwoR) and/or osteoarthrosis (OA) are determinants of horizontal mandibular and vertical ramus deficiencies.
  
  
  METHODS
  Bilateral MR imaging of the TMJ was performed in 68 consecutive patients with TMJ arthralgia to identify those with bilateral TMJ DDwoR and/or OA. Linear and angular cephalometric measurements were performed to apply selected criteria of horizontal mandibular (gonion-menton [Go-Me] <73 mm and articulare-pogonion [Ar-Pog] <105 mm) and vertical ramus (articulare-gonion [Ar-Go] <45 mm) deficiencies. Logistic regression analysis was used to estimate the association between selected MR imaging and cephalometric parameters.
  
  
  RESULTS
  In the age- and gender-adjusted analysis, significant increases in the risk of horizontal mandibular (odds ratio, 7.5:1; P = .031) and vertical ramus (odds ratio, 9.5:1; P = .003) deficiencies occurred with bilateral DDwoR and OA.
  
  
  CONCLUSIONS
  In patients with TMJ arthralgia, the MR imaging parameters of DDwoR and OA seem important determinants of horizontal mandibular and vertical ramus deficiencies.
authors.affiliation: Private Practice, Oral and Maxillofacial Surgery, Wals-Siezenheim, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Bertram
authors.forename: Alexander
authors.initials: A
authors.lastname: Moriggl
authors.forename: Ansgar
authors.initials: A
authors.lastname: Rudisch
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Emshoff
mesh_terms: D000293:Adolescent; D000328:Adult; D018771:Arthralgia / Q000175:diagnosis; D002508:Cephalometry / Q000379:methods; D002680:Chin / Q000473:pathology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D004204:Joint Dislocations / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008335:Mandibular Condyle / Q000473:pathology; D008336:Mandibular Diseases / Q000175:diagnosis*; D008875:Middle Aged; D010003:Osteoarthritis / Q000175:diagnosis*; D054850:Osteophyte / Q000175:diagnosis; D010026:Osteosclerosis / Q000175:diagnosis; D016059:Range of Motion, Articular / Q000502:physiology; D013701:Temporal Bone / Q000473:pathology; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis*; D013706:Temporomandibular Joint Dysfunction Syndrome / Q000175:diagnosis; D055815:Young Adult