Immediate Management of Spontaneously Reduced Traumatic Knee Dislocation

Critical Initial Assessment

The American College of Radiology recommends assessing vascular status immediately, checking for absent pulses, pallor, cool extremity, or delayed capillary refill, as popliteal artery injury is limb-threatening and requires emergent intervention 1, 2
The American College of Radiology suggests evaluating neurological function, testing for peroneal and tibial nerve injuries, which cause significant morbidity and affect long-term limb functionality 1

The American College of Radiology recommends obtaining anteroposterior and lateral views as the initial imaging study, looking for fractures, joint space abnormalities, and signs of dislocation 1, 3, 2
The American College of Radiology suggests ordering CTA of the lower extremity immediately if any signs of vascular compromise are present, as CTA is less invasive than conventional angiography with similarly high accuracy for detecting popliteal artery injuries 1, 3, 2

The American College of Radiology recommends ordering MRI without IV contrast after initial radiographs to evaluate the extent of multiligamentous injury, meniscal tears, and occult fractures, as MRI is accurate for evaluating soft-tissue, osseous, and neural injuries after knee dislocation 1, 3, 2
The American College of Radiology suggests considering CT without contrast for better characterization of complex fractures, particularly tibial plateau fractures identified on radiographs 1, 2

The American Society of Anesthesiologists recommends preparing for urgent surgical intervention if vascular injury is confirmed, as arterial injuries must be repaired first to preserve limb viability 4
The American Society of Anesthesiologists suggests applying damage control principles with temporary stabilization by external fixators rather than definitive osteosynthesis in hemodynamically unstable patients with severe limb trauma 4

The American College of Radiology notes that popliteal artery disruption occurs in 7.5-30% of cases, highlighting the importance of prompt vascular imaging and intervention 1

The American College of Radiology emphasizes the importance of not delaying vascular imaging if any concern for arterial injury exists, as time to revascularization is critical for limb salvage 1
The American College of Radiology recommends not ordering MRI with IV contrast for routine evaluation, as non-contrast MRI is sufficient and appropriate 2