title: Greater mandibular horizontal condylar angle is associated with temporomandibular joint osteoarthritis.
abstract: BACKGROUND
  Research using magnetic resonance imaging analysis has shown that internal temporomandibular joint derangement is associated with significantly greater horizontal condylar angle. However, the association between osteoarthritic (OA) bony changes as shown on computed tomography and horizontal condylar angle has never been evaluated.
  
  
  OBJECTIVE
  To investigate the relationship between mandibular condylar angle and OA degenerative changes.
  
  
  METHODS
  This is a retrospective study using cone beam computed tomography images and reports from 60 patients with unilateral OA degenerative changes and 43 control patients with no OA-affected joints.
  
  
  RESULTS
  Condylar angles in the joints of control patients and the unaffected joints in OA patients were not significantly different. The mean horizontal condylar angle in the unilaterally OA-affected joints (29.5° ± 10.5°) was larger than in the contralateral unaffected joints (22.5° ± 7.7°) (P < .001). In the OA-affected joints, flattening and erosion of the articular eminence was associated with a greater condylar angle (P < .05).
  
  
  CONCLUSIONS
  Moderate to severe degenerative temporomandibular joint change is associated with greater horizontal condylar angle.
authors.affiliation: Assistant Professor and Assistant Program Director, Oral and Maxillofacial Radiology Residency Program, Department of Oral Medicine, University of Washington, Seattle, WA. Electronic address: plee@uw.edu.
authors.forename: Peggy P
authors.initials: PP
authors.lastname: Lee
authors.affiliation: Dental Student, Department of Oral Medicine, University of Washington, Seattle, WA.
authors.forename: Alexander R
authors.initials: AR
authors.lastname: Stanton
authors.affiliation: Professor Emeritus, Department of Oral Medicine, University of Washington, Seattle, WA.
authors.forename: Lars G
authors.initials: LG
authors.lastname: Hollender
mesh_terms: D016022:Case-Control Studies; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D008297:Male; D008335:Mandibular Condyle / Q000000981:diagnostic imaging / Q000473:pathology*; D008875:Middle Aged; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000473:pathology*; D012189:Retrospective Studies; D012307:Risk Factors; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging / Q000473:pathology*