title: Discrepancy of coronal morphology between mandibular condyle and fossa is related to pathogenesis of anterior disk displacement of the temporomandibular joint.
abstract: OBJECTIVE
  To evaluate whether morphological discrepancy between the mandibular condyle and fossa of the temporomandibular joint (TMJ) is related to disk displacement on magnetic resonance imaging (MRI).
  
  
  METHODS
  This study included 61 patients with unilateral internal derangement based on both MRI and clinical examination. Coronal morphologies of the condyle and fossa were divided into four groups based on Öberg's classification. According to the coronal morphology of the condyle and fossa, all joints were dichotomized into either harmonized group or a discrepancy group (e.g., angled condyle and concave fossa). The incidence of discrepancy and the relationship of the discrepancy to other findings on MRI were statistically evaluated.
  
  
  RESULTS
  The discrepancy had a significantly higher incidence on the affected side. The discrepancy correlated with incidence of disk deformity on the affected side.
  
  
  CONCLUSIONS
  Morphological discrepancy between the condyle and fossa is related to development of anterior disk displacement in the TMJ.
authors.affiliation: Assistant Professor, Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry, Tokyo, Japan. Electronic address: matsumoto@dent.nihon-u.ac.jp.
authors.forename: Kunihito
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Shigeo
authors.initials: S
authors.lastname: Kameoka
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Amemiya
authors.forename: Hisaya
authors.initials: H
authors.lastname: Yamada
authors.forename: Masao
authors.initials: M
authors.lastname: Araki
authors.forename: Kazuo
authors.initials: K
authors.lastname: Iwai
authors.forename: Koji
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Kazuya
authors.initials: K
authors.lastname: Honda
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008335:Mandibular Condyle / Q000473:pathology*; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000209:etiology / Q000473:pathology*