Magnetic Resonance Evaluation Between the Relation- ship of the Temporomandibular Joint Disk and condylar Head Displacement

SUMMARY Objectives: To examine the relationship between condylar position and disk displacement in the temporomandibular joint (TMJ). Methods: 564 joints with no disk displacement (NDD), 114 joints with reducible displaced disk (RDD) and 36 joints with permanently displaced disk (PDD) were diagnosed. The assessment of the condyle and TMJ disk positions was based on the sagittal plane magnetic resonance (MR) images (the position of the disk was controlled by coronal images). Results: There were significant differences in condyle position between the joints with NDD and RDD (χ²-test, P<0,000), while there was no difference between those with NDD and PDD (χ²-test, right: P=0,112; left: P=0,225). There was also a significant correlation between bilateral condylar position and disk displacement in the TMJ (χ²-test, P<0,000). Conclusions: We suggest that if the disk displacement is reducible, the condyle is displaced posteriorly: in joints with PDD the condyle returns to the concentric position. These data also suggest that any change in condylar position induced by a change on the opposite side was essential.

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