Patellar Tendinosis

Go to a physiotherapist or chiro who can assess the actual origin of the problem (ask around and find someone GOOD. When you start hearing the same name over and over from runners who have been helped, go there.) Your knee pain can be from pelvic misalignment, or even from your feet (and your knee is just taking all the strain). Google pelvic alignment and your injury, lots of info out there that may resonate with you.

You're just gonna have to hunker down for a while. I set myself back by trying to cross train. Focus on icing and core work lifting weights for a while. After 7 weeks off, I'm finally able to start cross training and bending my knee.

Seeing a good sports-chiro for hip alignment issues is a good idea.

PHYSICAL THERAPY!

you have to do pt, it is what will get you back out and running. also, like the guy before me said, you need to just lay off for 3-4 weeks. the cross training you should do is going to pt and doing the exercises that they give you at home as well. that along with stretching and strengthening will get you healthy and youll come back stronger and faster.

it sucks but you cant run with it and you really shouldnt try to do much cross training, at least initially and not without talking to a pt.

as someone who has had seasons ruined by this you have to take time off from running/cross training and strengthen the shit out of your leg.