What is considered the gold standard study in someone with knee dislocation to evaluate vascular injury?

• A. XRAY
• B. U/S + ABI
• C. Angiography
• D. MRI

Answer: (C)

Assessing vascular injury is critical after a knee dislocation because the popliteal vessels lie just behind the knee and can be damaged with dislocation. The imaging study that serves as the reference standard for detecting arterial injury is angiography because it directly images the arterial lumen and blood flow, revealing occlusion, dissection, transection, or evolving thrombosis and guiding treatment. Noninvasive options like duplex ultrasound with an ABI can screen quickly but are more operator-dependent and may miss subtle or evolving injuries. X-ray assesses bone alignment but not vascular status, and MRI, while excellent for soft tissues, isn’t used for acute vascular evaluation. In modern practice, CT angiography is a common rapid alternative for vascular assessment, but conventional angiography remains the definitive standard for evaluating arterial integrity in this setting.