Should I do proprioception retraining on both ankles or just the injured ankle?

I was just on a follow-up webcam call with a runner who has chronic ankle instability but wants to get back to running on trails.

She is trying to decide when it is safe for her to make the transition from running on a smooth, flat surface like asphalt to running on uneven technical trails. 

Since she had a long time off of running for a long time and she does not want to get re-injured. 

She asked me a great question on a recent call. 

“Should I be doing this proprioceptive retraining on both ankles or just the injured ankle?”

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