Imaging Modalities for Temporomandibular Joint Evaluation

Imaging Selection Based on Suspected Pathology

Contrast-enhanced MRI is currently the best method to detect active TMJ inflammation and is considered the gold standard for evaluating ligament and articular capsule structures, according to the American College of Radiology 1, 2
CT or CBCT is the gold standard for bone lesion assessment and should be used when condyle and glenoid cavity involvement is suspected, as recommended by the American College of Radiology 1, 3
For TMJ bone disease, CBCT or CT scan is indicated in clinical cases with suspected condyle and glenoid cavity involvement based on medical history and clinical examination, according to the American College of Radiology 4

Panoramic radiography (OPT) and other conventional radiographic images are insufficient for assessment of TMJ structures, as stated by the American College of Radiology 1, 4
Conventional radiography does not supply adequate information about joint components and ligament-capsule components (disc), according to the American College of Radiology 4

Contrast-enhanced MRI is specifically recommended for detecting active TMJ arthritis in JIA patients, as recommended by the American College of Rheumatology 2, 5
MRI should be considered for monitoring TMJ involvement in JIA patients, according to the European League Against Rheumatism 6, 7
Clinical examination alone may miss TMJ inflammation in up to 42% of cases, highlighting the importance of imaging, as reported by the European League Against Rheumatism 7

The presence of a small amount of TMJ fluid and/or minor contrast enhancement may be considered normal variation rather than a sign of active TMJ arthritis, as noted by the American College of Rheumatology 2
Interpretation of MRI findings has an element of subjectivity and is influenced by technique, equipment, and reader expertise, according to the American College of Rheumatology 2
Using CBCT solely to obtain lateral and panoramic projections exposes patients to unnecessary radiation when the same information can be obtained with lower radiation dose techniques, as stated by the American College of Radiology 1, 4

The American College of Radiology recommends CT scans for evaluating mandibular condyle fractures, particularly posterior and minimally displaced fractures, with a sensitivity of nearly 100% for detecting mandibular fractures 8
CT scans with multiplanar reformations are superior to radiography for evaluating mandibular condyle fractures and identifying comminution and displacement critical for surgical planning 8
Panoramic radiography has limited sensitivity for detecting condylar and subcondylar fractures with anterior displacement, and nondisplaced/minimally displaced anterior fractures, making it insufficient for TMJ assessment 8

Panoramic radiography can better visualize dental root fractures compared to CT, but this is irrelevant for TMJ pathology 8

Clinical examination alone fails to detect active temporomandibular joint (TMJ) inflammation in approximately 42 % of cases, resulting in a high false‑negative rate. 9

Contrast‑enhanced magnetic resonance imaging (MRI) is specifically recommended for the detection and monitoring of TMJ arthritis in patients with juvenile idiopathic arthritis. 9, 10
Clinical assessment correctly identifies only 58 % of patients with MRI‑confirmed active TMJ arthritis; the most reliable clinical indicator is a reduced maximal incisal opening. 9
Because MRI is more sensitive than clinical examination, it should be employed for longitudinal monitoring of TMJ arthritis in JIA. 9