How to tell soft tissue vs bone injury in a runner

All overtraining injuries are difficult. 

The problem is that you're trying to not lose your running fitness while giving the injured part enough of a rest so it can actually heal.
 
A runner asked me an interesting question the other day, he actually said, “Okay, if I have bruising and swelling, does that mean I'm more likely to have a bone injury or a soft tissue injury?”
 
What are the key differences between a soft tissue injury and a bone injury in a runner? 
 
Well, that's what we're talking about today on the Doc On The Run Podcast.