Imaging for Patient with Jaw Pain and Limited Mouth Opening

Recommended Imaging Approach

CT with multiplanar reformations is the primary imaging modality for patients with persistent jaw pain, swelling, and limited mouth opening, providing superior delineation of osseous and soft-tissue structures with high image resolution 1
CT is nearly 100% sensitive for detecting mandibular fractures and pathology, allowing detection of subtle nondisplaced fractures that may be missed on conventional radiography 1
The American College of Radiology recommends CT for evaluating the temporomandibular joint (TMJ) when bone involvement is suspected, with superior visualization of the TMJ compared to conventional radiography 2

Limited mouth opening is a classic sign of mandibular fracture or TMJ disorder, with a high sensitivity for detecting these conditions 4
Pain during jaw movement is consistent with fracture or TMJ dysfunction, and swelling indicates potential inflammatory process or trauma 4

For suspected TMJ inflammation or soft tissue involvement, MRI would be the gold standard, but given the symptoms of pain, swelling, and limited opening, CT is preferred initially to rule out bony pathology 2
Mandibular fractures often occur in pairs (67% of cases) due to the U-shaped configuration of the mandible, with CT being nearly 100% sensitive for mandibular fractures 1, 4

Conventional radiography is insufficient for comprehensive assessment of TMJ structures, with a sensitivity of only 86-92% for mandibular fractures 2
20-40% of patients with mandibular fractures have additional injuries, including intracranial injuries (39%) and cervical spine injuries (11%), highlighting the need for thorough evaluation 1, 4