Posterior Sag Sign (Godfrey's Test) Special Test

What is it used for?

• Visual assessment of PCL integrity.

How to Perform

• Position: Patient lies supine with hips flexed 45° and knees flexed 90°.
• Action: Observe the profile of the tibia from the side.

Interpretation of Results

• Positive Test: The tibia “sags” or drops back visibly compared to the femur (loss of the normal tibial step-off).

Diagnostic Accuracy

• Sensitivity: 79%
• Specificity: 100%

References

• Magee, D. J. (2021). Orthopedic Physical Assessment.