Knee
Posterior sag sign
Godfrey-test
- What you examine
- Posterior cruciate injury, visible without applying force.
- Procedure
- Supine, both hips and knees flexed to 90 degrees with the lower legs supported. Look from the side at the contour of the tibial tuberosity, comparing left and right.
- Positive when
- On the affected side the tibia visibly drops posteriorly relative to the femoral condyles.
- What the test is worth
- High specificity, lower sensitivity: a visible sag confirms the injury, but its absence does not rule it out.
- Caution
- Always do this test before the drawer tests. It costs nothing and it prevents you from misjudging the neutral position.
- Joint
- Knee joint
- Body region
- Knee