If there is no cause of the problem other than the torn PCl, you may consider how the hip is impacting on the knee as Hoppenfeld and others infer.

You might see if there is a hip imbalance by landmarking the ASIS to ASIS and having the patient do hip abduction directly lateral in the coronal plane and note if there is a superior or inferior movement of either or both of the ASIS

Then do an ASIS to PSIS on each side with the patient doing a hip abduciton directly lateral in the coronal plane. If either or both are moving into anterior or posterior rotation, the hip may be affecting the knee by extra pressure to it. That is my area of research.

I find that many patients with a knee problem are having an effect on the knee from the hip

For more ideas on the PCL you might contact a sports injury practitioner.

Hope this is of help.

Best regards,

Neuromuscular.