Which option describes the Godfrey’s sag test finding?

• A. The involved leg’s tibial tuberosity sagging more than the non-involved leg.
• B. The tibial tuberosities are level between legs.
• C. External rotation of the foot is required for positivity.
• D. The patient must stand on one leg to test.

Answer: (B)

Godfrey’s sag test checks the integrity of the posterior cruciate ligament by looking for a posterior displacement of the tibia when the knee is flexed. Have the patient lie on their back with the knee bent to 90 degrees and the hip flexed to about 45 degrees. Compare both legs; if the PCL is damaged on the involved side, the tibia will sag backward, so the involved tibial tuberosity sits lower/posterior to the other leg. That posterior sag is the positive sign. The tibial tuberosities being level between legs would mean no sag and a negative test. External rotation of the foot or standing on one leg are not part of this test.