Are you using a treadmill for returning to running after an injury?

Today I was out on a run and I was thinking about treadmills versus running outside. To be fair, I was actually running outside during this run. 
 
It seems like most of the runners who sign up for the Fast Track challenge, or who call me for a second opinion, the majority of them like to run outside. 

I have a question  for you.
 
If you got an overtraining injury like a metatarsal stress fracture, calcaneal stress fracture, or a tibial stress fracture, plantar plate sprain, the question is... Are you running on a treadmill to ease back into running, or are you just running outside, to see how running feels after your injury?
 
Are you using a treadmill for returning to running after an injury? 
 
Well, that's what we're talking about today on the Doc On The Run Podcast.