Procedure

  1. Patient supine with knees flexed 90° and hips flexed approximately 45°
  2. Examiner compares prominence of tibial tuberosities bilaterally.
Posterior Sag Test for PCL knee test

Examiner compares prominence of tibial tuberosities bilaterally

Interpretation

Positive Posterior Sag Sign

Tibia “sags back” or “drops back” on the femur: Posterior cruciate ligament tear (posterior translation knee instability)

Clinical Notes

Synonym: Gravity Test
Clinicians option: patient flexes hips 90° and knees 90°, examiner observes for posterior shift of tibia (Godfrey Test).