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Table 3 The relationship between the position of the disc on MRI and the displacement of the condylar head on plain X-rays

From: Characteristics of temporomandibular joint structures after mandibular condyle fractures revealed by magnetic resonance imaging

MRI plain X-rays N   Position of disc  
At eminence In fossa Normal
Anterior Down Anterior + down
Dislocation 18 17 (36)    1 (2)  
Displacement 10 5 (11)   1 (2) 2 (4) 2 (4)
No displacement 15   3 (6) 2 (4) 2 (4) 8 (17)
Lateral displacement 2   2 (4)    
Chip fracture 2 1 (2)     1 (2)
Contralateral 21 1 (5) 4 (19) 4 (19) 1 (5) 11 (52)
  1. ( ): % in total fractured or contralateral joints
  2. p < 0.01 (statistically significant for disc position and fracture, chi-square test)