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 %
- Campbel's Operative Orthopaedics 13th Book