Management of Subtle Tibial Plateau Feature

Initial Imaging Approach

• The American College of Radiology recommends CT as the appropriate next step after radiographs show a subtle tibial plateau abnormality, as CT demonstrates 100% sensitivity for detecting tibial plateau fractures compared to 83% for radiographs alone and is superior for characterizing fracture severity 1, 2, 3
• CT provides critical information about articular surface depression, which predicts associated soft tissue injuries—specifically, depression >11 mm indicates higher risk of lateral meniscus tear and ACL avulsion fracture 1, 2, 3
• The amount of articular surface depression on CT serves as a predictor of meniscal and ligamentous injuries and helps determine when MRI is indicated to confirm or exclude these injuries 1, 2

When to Add MRI

• Order MRI after CT if any of the following are present: articular depression >11 mm on CT, clinical suspicion of meniscal or ligamentous injury, surgical planning is being considered, or need to evaluate for bone marrow contusions or occult fracture extension 1, 2, 3
• MRI has superb contrast resolution and multiplanar capability, making it highly accurate for evaluating bone marrow contusions, occult fractures, meniscal injuries, and ligamentous injuries 1, 2, 3

Imaging Modalities to Avoid

• Do not order MR arthrography or MRA for tibial plateau fracture evaluation—these are not indicated for bone or soft-tissue injury assessment 1, 2, 5
• Do not order bone scan with SPECT or SPECT/CT as the next imaging study, as it has lower sensitivity, specificity, and accuracy than MRI for evaluating associated injuries 1, 2, 3
• Do not order ultrasound as the next imaging study for tibial plateau fractures, though it may demonstrate lipohemarthrosis indicating intra-articular fracture 2, 3

Clinical Pitfalls

• Radiographs miss 17% of tibial plateau fractures that CT detects, so a "subtle feature" warrants advanced imaging rather than clinical observation alone 1, 2, 3
• CT can detect bony avulsion fractures with 80% sensitivity and 98% specificity, which may indicate ligamentous injury requiring different management 1, 2