Radiography remains the first line of imaging in the setting of knee trauma. Accurate description of distal femoral and proximal tibial fractures according to the commonly used orthopedic classifications is essential for proper communication with the orthopedic surgeon. Fracture patterns on radiographs determine the severity of the injury, clinical prognosis, and the need for further imaging with computed tomography (CT) or magnetic resonance imaging (MRI). Understanding the common mechanisms of injury allows recognition of subtle radiographic findings that indicate the presence of internal derangement, thus guiding the clinical management and the use of advanced imaging.
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