Relationship between increased horizontal condylar angle and resorption of the posterosuperior region of the lateral pole of the mandibular condyle in temporomandibular joint internal derangement.
OBJECTIVE
The purpose of this study was to analyse the relationship between horizontal condylar angle, temporomandibular joint (TMJ) disk displacement and resorption of the lateral pole of the mandibular condyle (RLC).


METHODS
The study comprised 162 TMJs (81 patients). Disk displacement was assessed and the horizontal angle of the condyle was measured on axial MR images. RLC was assessed on oblique frontal projection plain radiographs.


RESULTS
The horizontal angle was increased in joints with disk displacement without reduction (one-factor ANOVA and Scheffe's f-test, P<0.05). The angle was greater in joints with RLC than in the joints without RLC (Student's t-test, P<0.05).


CONCLUSIONS
Results suggest that the horizontal condylar angle is increased in joints with disk displacement without reduction. A possible relationship exists between RLC and increased horizontal condylar angle.
Kurita
H
H
Department of Dentistry and Oral Surgery, Shinshu University School of Medicine, Matsumoto, Japan. hkurita@hsp.md.shinshu-u.ac.jp
Ohtsuka
A
A
Kobayashi
H
H
Kurashina
K
K
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D001862:Bone Resorption / Q000473:pathology; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008335:Mandibular Condyle / Q000473:pathology*; D008875:Middle Aged; D010003:Osteoarthritis / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000473:pathology*