How likely is a setback if I run while stress fracture heals?

Today I got a great question from a runner who had a 4th metatarsal stress fracture while training for a marathon. He wanted to know how likely it was to get a setback, or re-injury, if he is running while the stress fracture heals.

How likely is a setback if I run while my stress fracture heals? 

Well, that's a great question and that's what we're talking about today on the Doc On The Run Podcast.