What sort of Pathology are you referring to? I assume it's the stiffness of movement post op. This kinesio tape technique looks like one used for Lymph problems and I've not seen it before like that on a knee. Is the range of movement you describe
0°-3°-80°? which means 3 degrees of extension are missing and flexion finishes at 80° before a "right angle" is reached?
Firstly: 6 weeks for many knee arthroplasties is still very early. I see quite a number and some, for some reason have excellent movement reaching 90° quickly and some take longer. Some have difficult wound healing problems, some have soft tissue adhesions to be dealt with, some have oedema problems. Most have had muscular difficulties due to pain/lack of use beforehand. Some stay restricted in motion longer and in a couple of cases the surgeon has basically told me: "no idea why". Sometimes there is a problem with the protheses parts. So, back to your question: you must decide which of the possible problems are a problem and deal with them accordingly. Check with the patient when the next appointment is by the surgeon and write a short physio report to the surgeon or speak directly if it's possible. Patients can of course also ask but they aren't heath professionals. As to kinesiotaping you have to assess the suitability of the patient skin and scarring, allergies, circulation problems (clotting) and why you want to use the tape. is it for stereognosis, increasing or decreasing muscle tone of specific muscles, correction of patella movement, lymph, etc etc. I 've just thrown in a few ideas here to let your mind go over. Maybe it's helped a bit!