Oh my, some physical therapists really excel at scare tactics don't they? I was threatened with an MUA on my 1st post op day. I literally laughed at her & you've never seen anyone more taken aback. I think you need a focused game plan for your extension issues, which if they have existed for a number of years they are not going away overnight! As for the crutches, my OS keeps all his patients on some sort of assistive device, walker or crutches for at least 4 weeks or the 1st post op visit. And he didn't want them tossed until I could walk without a limp, and he wanted me to use a cane outside for another 2-3 weeks, even tho I didn't have a limp. Do what feels right for knee and your safety when walking.