Posterior Sag Sign

Other Names

• Posterior Sag Test
• Godfrey Test

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Purpose

Sag sign examination reveals a noticeable difference in tibial plateau posterior translation between the uninjured left (L) and injured right (R) knee.

• Evaluate integrity of Posterior Cruciate Ligament

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Description

• The patient is supine
• The hip and knee flexed to 90º while the examiner supports the leg
• Observes for a posterior shift of the tibia as compared to the uninvolved knee
• Positive test
  • Abnormal contour or sag may be evident at the proximal anterior tibia viewed from a lateral position
  • Suggests PCL tear

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Pathology

• PCL Injury

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Evidence

• Unknown

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See Also

• Knee Pain (Main)
• Physical Exam Knee

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