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PCL injuries can sometimes have involvement of the posterolateral corner (PLC)
The dial test can be used to diagnose posterior lateral instability and help differentiate it from isolated PCL injuries
The dial test involves comparing the amount of external rotation of the lower leg at the knee while the knees are in 30° and in 90° of knee flexion.
https://www.youtube.com/watch?v=rnk62Y-nDSQ
An isolated injury to the posterolateral corner will result in more than 10° of external rotation in the injured knee that is present at 30° but not at 90° of knee flexion.
http://www.kneejointsurgery.com/wp-content/uploads/2015/06/DIAL-TEST.jpg
http://www.kneejointsurgery.com/wp-content/uploads/2015/06/DIAL-TEST-90.jpg
References
http://www.kneejointsurgery.com/ligament-injuries/posterolateral-corner/