Imaging of the anterior cruciate ligament

Figure 13 Posterior cruciate ligament buckling and Posterior cruciate ligament line sign. Sagittal intermediate-weighted magnetic resonance knee image of a completely torn anterior cruciate ligament. A: Posterior cruciate ligament (PCL) buckling sign. The PCL is considered to be hyperbuckled if any portion of its posterosuperior border is concave (white arrow); B: The PCL line sign. A line tangential to the posterior margin of the PCL is drawn (black line) and if this tangent does not intersect the posterior cortex of the femur within 5cm of its distal end, the PCL line is considered to be positive.