Posterior Sag Sign

 Posterior Sag Sign

What is Posterior Sag Sign?

  • Posterior Sag Sign is used to assess the integrity of the posterior cruciate ligament of knee (PCL tears).

How it's Performed?

  •  Patient is supine, their hips flexed to 45 degrees and their knees flexed to 90 degrees and their feet are flat on the table.
  •  Observe the profile of both knees from the side of the table.

What does a positive Posterior Sag Sign mean?

  • Positive sign when the affected tibia sags posteriorly compared to the unaffected knee.

Sensitivity & Specificity

  • Sensitivity: 79 -100%
  • Specificity: 100 %


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