Sounds like a lax or stretched ACL allowing a posterior sheer on the joint line. The action of doing a calf raise involving either soleus or gastrox will co-activate on many occasions the hamstrings as well. In this later case the laxity of the ACL will be more evident in that it will compress already irritated structures. Check for the patients soleus length in a squat, and as for the taping, sounds like it is just stating the obvious tendency to quads dominance in these types of patients. Hence use it as a guide to what to inhibit rather than correct PFJ alignment. rich