Posterior Sag Sign / Godfrey’s Test / Step-Off Test

Execution:

  1. Patient is in supine lying position with the hip in 45° and the knee in 90° of flexion
  2. The examiner then looks for a ‘sag’ of the tibia posteriorly in comparison with the tibia of the other leg
  3. Some authors describe that the posterior sag is more marked when the examiner holds onto the patient’s heel while the hip is flexed to 90° and gravity pulls on the leg

 

Positive Outcome: In a normal situation the tibia plateau sticks out 1 cm anteriorly in relation to the femoral condyles. With a torn PCL this step is lost, which is why this test is also called Step-Off Test

Study

Reliability

Sn Sp LR+

LR-

Rubinstein et al. (1994)

NA

79 100 88.35

0.28