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Updated: Aug 13, 2026
Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
Published on: December 18, 2016
[RMI of dysfunctional temporomandibular joint (TMJ). Value of gradient-echo T1 sequences in the evaluation of bony
P Sarrat1, F Cheynet, C Chossegros
1Service de Radiologie et d'Imagerie Médicale, Hôpital Saint Joseph, Marseille.
Purpose:
To identify and classify the different types of bony changes of the condyles in patients with disorders of the temporomandibular joint (TMJ).
Materials And Methods:
Since 1993, we have imaged over 600 patients with 0.5T MR unit by using gradient-echo T1-weighted sequences in the sagittal and coronal planes.
Results:
We will first describe the appearance of the normal TMJ. Then, we will introduce the concept of "Condylo-diskal disunion" using a three grade classification system. We will then describe three patterns of condylar changes: adaptive remodeling, either anterior or more frequently posterior, degenerative lesions with subchondral sclerosis, erosive lesions due to synovial hyperplasia.
Conclusion:
Using a 0.5T MR unit, a GRE T1 sequence is useful to identify lesions of the disk and detect bony changes. In addition, the tissues posterior to the disk can also be assessed on postcontrast images.
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