I just had a conversation with a runner who signed up for one of the self-help courses. She booked a short call just to get a jumpstart, prioritize and figure out what she really needed to do first, so she could get better as quickly as possible. 

“Okay, based on what we talked about, are you sure that my ligament is not going to just rip apart if I start running?”

I said,

“No, I'm not sure of that at all. In fact, we didn't even talk about your injury. You told me that you think you have this injury. But you (and your doctors) are not even 100% certain you have a ligament injury. You don't even know what's really wrong. Right now, you don't know where you are, because you have no reliable data."

You cannot run early without data.