MRI for Suspected Navicular Fracture

Diagnostic Challenges and Imaging Algorithm

The American College of Radiology recommends obtaining an MRI immediately when a navicular fracture is suspected on X-ray, as the navicular is a high-risk stress fracture location where delayed diagnosis can lead to significant complications 1, 2
The navicular bone is classified as a "high-risk" location for stress fractures, along with other specific bones, and delayed diagnosis can lead to serious complications 2
Standard radiographs should be the first imaging study for any suspected fracture, but immediate MRI is indicated when radiographs show a suspected navicular fracture or clinical suspicion remains high despite negative radiographs 1, 3, 4, 5
MRI without contrast is the preferred modality for detecting navicular fractures, as it demonstrates bone marrow edema patterns, has superior sensitivity compared to CT, and can identify associated soft tissue injuries 4, 5, 7
MRI findings can guide treatment decisions and predict time to return to activity, with higher MRI grades of injury correlating with longer recovery times 2, 6

CT can be considered as an alternative or complementary study when MRI is contraindicated or unavailable, or when there is a need to better characterize fracture displacement or comminution for surgical planning 4, 7
The American College of Radiology suggests that ultrasound should not be used as primary imaging for navicular fractures, as it has poor sensitivity for detecting navicular fractures 3
The American College of Radiology recommends against relying solely on radiographs to rule out navicular fractures, especially in athletes with persistent symptoms, and against delaying MRI when clinical suspicion is high 1, 2