MRI Without Contrast for Elbow Joint Effusion

Diagnostic Approach

Radiographs should be the first imaging study performed to assess for fractures, dislocations, and joint effusion, identified by posterior and anterior fat pad elevation, according to the American College of Radiology 1, 3
An elbow joint effusion on radiographs may indicate an occult fracture, particularly in the context of trauma, as stated by the American College of Radiology 1

When radiographs show an effusion but no visible fracture, further imaging is warranted to evaluate for soft tissue injuries, including ligament tears, as recommended by the American College of Radiology 2, 4
MRI without contrast is highly sensitive for detecting bone marrow edema associated with occult fractures, ligament and tendon injuries, according to the American College of Radiology 2, 4
MRI with contrast offers no significant advantage for evaluating simple joint effusion and is primarily indicated for specific evaluation of intra-articular bodies and assessment of osteochondral lesion stability, as stated by the American College of Radiology 4

According to the American College of Radiology Appropriateness Criteria, MRI without contrast is usually appropriate for evaluation of elbow pain with normal or nonspecific radiographs 2, 4
MRI is as sensitive as 3-phase bone scan for detection of stress fractures but provides superior soft tissue detail, as reported by the American College of Radiology 4
T2-weighted images are particularly recommended for evaluation of joint effusions and associated pathology, according to the American College of Radiology 4
Assuming all elbow effusions represent occult fractures is a common pitfall to avoid, as other causes include ligament injuries and synovial pathology, as noted by the American College of Radiology 4
Using contrast unnecessarily is another pitfall, as non-contrast MRI is sufficient for initial evaluation of most elbow effusions, as stated by the American College of Radiology 2, 4